Well, it’s probably a good part cultural difference.
Yes, folks, the United States does have unique cultural attributes. I don’t know why this would shock anyone, but it seems to (not that I’m claiming the OP poster is shocked - puzzled may be closer to the state of mind).
Well, let’s see… yes, I think having a written constitution where the very first item on the “Bill of Right” is freedom of speech is of some influence in this matter.
And the fact that many of us, or our ancestors, came to these shores due to various forms of oppression in the “old country” is also a factor.
As a cultural trait, one that may indeed set us apart from many other cultures, we Americans most certainly do not like the government telling us what to do, whether we agree with the government or not. It’s not just a matter of opposing things you don’t like - we also have tendencies to oppose government mandates of things we in fact approve of. Seat belts, for instance - there is a sizable segment of our population who agree that seat belts in cars are life savers and should always be worn BUT who also oppose mandatory seat belt laws. It’s not the seat belts being objected to, but the idea of the government telling us what to do. Ditto for things like motorcycle and bicycle helmets. Then there are those of us who think tobacco is a killer drug and no one should smoke - yet who also support the idea of, say, a bar or restaurant making their own choices whether to allow smoking on the premesis or not, rather than having the government dictate to the businesses.
Why? Gosh, I don’t know exactly - surely our past has something to do with it, and because for much of our history you could either move west to escape government control, or the government really didn’t have much power over you in daily life. Heck, even these days the most interaction the average American citizen has with the Feds is taxes and, late in life, social security/medicare. It’s nothing unsual for state government to be played off against the Feds and vice versa.
Paradoxically, we have also have a long history of a minority in the US trying to impose its will on the majority - go figure.
And, of course, various groups have been opposed IN this country as well.
Another thing - we don’t necessarally see messy, loud confrontation as a bad thing. We may have more tendency to air our dirty laundry in public than other folks. Again, a cultural difference.
Despite the acid invective during our politcal campaigns, we also have a tradition of the loser making a gracious concession speech at the end of the race - failure to do so would be a definite black mark against the candidate, much more so than losing a run for office. The winner must also be gracious and courteous to the loser, and gloating is considered extremely bad form. Even the worst of the mudslingers traditionally have a shake-hands-and-make-up ritual. For that matter, our primary races for things like president can result in some truly vicious inter-party battles, after which the losers pledge to support the winner in the final race against the other parties candidate. Some of the screaming is just for show. Remember that US elections do not devolve into violence, nor is violence at the polls tolerated. Sure, when you go to vote there’s a gauntlet you have to run of signs and campaign workers trying to convince they’re guy is the one to vote for, but there’s also a sharp line they can’t pass. Trust me, when we do get to the polling place it’s generally a remarkably quiet and civilized place where campaigning of any sort is strictly forbidden so one can make one’s choice in peace.