In the U.S. in particular, politics are designed in such a way that both major parties have platforms that prioritize corporate interests, hawkish foreign policy, and the surveillance state. The difference is in a small subset of issues, mostly "identity politics," that are greatly magnified considering the fact that there are no major opposition parties that prioritize people over corporations; these are mainly issues that have been largely settled in other Western democracies (i.e. Europe) for decades. Mainstream Democrats have far more in common with Republicans than they do with someone like Bernie Sanders or basically anybody from the extremely small left-wing parties. Conversely, Republicans have far more in common with Democrats than they do with right-wing libertarians (e.g. Jo Jorgensen, Gary Johnson).
Yeah, both sides already didn't like each other. However, I don't think I've seen people nearly as passionate about candidates or a president than in these last few years.
It's almost turned into one big sports team is going against other big sports team and your sports team sucks! Let's fight over it
The radical left has been bashing whites, in general, not even making an exception for poor ones, for half a century it seems. In that case, the rise of Trump is sad, but predictable.