Yes, of course all 340 plus million Americans are barbarians based on a disgusting act by a few people. Last election 60% turned out to vote and more half of them voted Biden.
And out of the remaining percentage how many of them do you think will see this as OK?
Americans are just like people in the UK, there is a wide spectrum of views. This behaviour only exists among a small group of people at one polarised end.
How would you feel if an American said that all the people in the UK are barbarians on the basis on the recent racist riots?