James P Hogan wrote a short story somewhat like that; a time traveler goes back to kill Hitler and promptly is told by harassed soldiers (“What, another one?!”) to go stand over there and wait to be interviewed with all the other time travelers who came to kill Hitler.
Another SF author (I can’t remember which, and it’s driving me nuts) used the concept as conclusive proof that not only won’t humanity build a time machine in the near future, but we never will : there’s no crowd of time tourists suddenly popping up at every important historical event.
You’d think someone would have noticed the crowd 100x times the total population of Palestine showing up at the Crucifixion 
Niven’s law says that if time travel permitted changing the past, eventually time travel would be edited out of the time line
Stephen Hawking suggested that the absence of time tourists means that no time travel will ever be invented Time travel - Wikipedia
Someone brought up the issue of nukes, which I think is an important one. Obviously the residents of Hiroshima and Nagasaki wouldn’t necessarily see it this way, but you could certainly argue that the use of nukes that actually happened in our timeline was about as minor as possible while still being horrifying enough to keep them from being used again in anger, ever. If they hadn’t been developed more or less exactly when they were, we might have ended up with a cold-war-like standoff in which the itchy trigger fingers behind the bunkers did NOT have such an incredibly strong example of why not to actually pull the trigger.
When people argue about whether we should have nuked Hiroshima, I always want to argue that if we hadn’t, we almost certainly would have used a lot more nukes, and a lot bigger ones, in Korea.
Yet another story (author unknown) had the first time traveler go back to interview Shakespeare, only to be told, “No pictures, please, you’ll have to talk to my agent.”
Seems that time travelers had been hanging around him since well before he was born.
They’d be damned sure to blend in/be camoflaged/invisible (Predator style at worst), or a mechanical sparrow with a minicamera will be flying around taking pictures/videos for them.
They made a whole video game series premised on this very issue, you know?
I saw a web comic I am still looking for it which shows 2 German soliders guarding a room. You then see a poof and a futuristic looking man comes out. The guards shoot him. They look at eachother and say. Hey man I love the Fuer but I have to wonder why all these time traverleres keep coming back tryign to kill him
I probably wouldn’t kill Hitler for precisely many of the reasons outlined in the OP. If Hitler never rose to power, I’m disinclined to believe that WW2 wouldn’t still happen within 5-10 years. Yes, the Holocaust is probably a lot less likely to have happened if Hitler weren’t in power, but also, like others mentioned, we might not have seen so much mismanagement of the war and possibly a similar number of additiional casualties may have occurred from another year or two of war.
Worse, Nuclear energy was due to be harvested soon, even without the war. How much many millions of deaths more could have occurred if the bomb had been developed in the middle of the war instead of right at the tail end? Without the mass exodus of Jewish Scientists to the US with their expertise and urging of the President to initiate a Nuclear program, I think it’s quite likely a more dangerous country might have gotten to it first, and we might have seen it used many more times, both in the war, and as a coercive threat afterward. If Germany had gotten it, they very well could have won. If Russia had gotten it, Communism very well could have overrun all of Europe or worse.
Assuming WW2 still would have happened, but probably a little later, how else may things have gone? Would the US economy have gotten stale enough in another 5-10 years of depression that we would have been a less effective ally? Might additional technological advantages prior to the start of the war made it even more deadly? It’s difficult to say.
And, of course, I think there’s some important lessons that all of humanity took from WW2 that we might not have learned yet or have had to have learned in an even harder way (otherwise, we’d have learned them sooner than WW2).
Stole your pears?
Well, looks like two options…either a bunch of little bad things that might happen…or 70 million people dying.
Personally, if I knew without a doubt that killing young Hitler would stop WWII from occuring, and save the lives of millions, then I would. But thats not something you could ever really know, and so that doesn’t translate so well into our terms of situational ethics.
But isn’t the qualifier for Judaism passed on by the MOTHER?
If you go back in time and kill Hitler, we lose all those great Downfall parodies!
Sure, but that would free up so many man-hours that could be put to other creative uses. It would be a veritable LOLcat renaissance.
Yes, but he sends the lot of them, male and female, to the Jewish Free State, a country carved out of the Caucasus (ostensibly to protect them), where presumably they slowly die out.
It would be like the sequence in that one Pink Panther movie — where a dozen agents are all trying to kill Inspector Clouseau, but all they can manage to do is kill each other and/or themselves, one by one.
Meanwhile, Clouseau/Hitler goes about his business, totally oblivious.
Don’t kill Hitler, introduce him to hipsterism.
One of the things Star Terk’s Gene Roddenberry wanted to do, was a story about the Enterprise crew going back in time to save JFK. When it’s discovered that the result would cause WWIII, they have to go back again and see that he does die. And get this, Spock is the shooter on the grassy knoll. Yeah, I know…and I’m a Trek fan.
That’s why Roddenberry wasn’t allowed much authority over Star Trek after the movies started. They did go back and save the whales though, which was alomost as bad a plotline.
That plot eventually became merged with the Guardian of Forever plot–Edith Keeler somehow became so popular teaching peace that people acquiesced to Germany even after the invasion of Poland. Hitler took over the world, but did not have the temperament to not use nuclear weapons, and wound up destroying the earth. (Or maybe he otherwise ran it into the ground. I can’t remember.) Originally, the consequences of saving Keeler were more personal.
Also, all of you are forgetting about Hitler’s Time Travel Exemption Act, which states that you can’t go back and try to kill Hitler without something going wrong. At the very least, it doesn’t change anything.
They did a better version of this on Red Dwarf - the crew (in a variety of hilarious ways) prevent Oswald from shooting Kennedy. They then discover that in the new timeline a surviving Kennedy got blackmailed by the Mob due to the Marilyn Monroe connection and was arrested for corruption. The crew rescue the “future” Kennedy from a police van at Idlewild Airport and convince him to go back in time with them and shoot himself from the grassy knoll.