Scientists are not some order of philosopher monks, who spend all day meditating on the correct ethical approach to everything that isn’t involved in their grand political conspiracies.
They are a group of actual people who comprise just as many idiots, incompetents, and crooks as just about any other profession.
When I worked in an academic lab I met plenty of great people, I also met people who I could honestly believe would falsify data to get ahead of their peers, as well as plenty of people who were so god-damned incompetent that they might as well have been.
If anything I’m absolutely astonished that you could nab over tens years of emails and come up with the weak stuff that they did. I guarantee you that far worse stuff happened at that institution over that time period and has escaped notice primarily because people don’t generally tell other people that they are falsifying results, especially in emails 
Now is some of the stuff from those emails evidence of shaky ethical practice, yes it is. Is it in any way unusual, no it is not.
In particular, drawing figures in such a way as to present data in the best possible light is endemic in academia. I personally got mildly criticised in my thesis defence for not expressing data in what the examiner believed to be the best possible way, and which I believed to be slightly misleading. However, as long as all of the relevant data is still present in the figure in question this should be a minor issue, any competent scientist or scientific journalist should be capable of spotting the “trick” and noting the attempt to obfuscate.
So no, scientists are not perfect, but neither are lawyers, or journalists, or teachers, or politicians, or the police.
I’m not going to weigh in on the side of AGW because I know pretty much nothing about the facts surrounding the issue, but I would note that the people who do know what they are talking about seem to have formed a pretty solid consensus and the notion that these e-mails undermine that or suggest any kind of organised conspiracy is completely laughable, especially considering the self interested nature of many of the organisations funding the anti-AGW campaign.
At the end of the day, pretty much all these emails tell us, is that a decade ago a researcher wanted to pretty up one of his graphs, and if you think that constitutes a smoking gun I have some stunning landmarks you might be interested in buying.