I don't think it's the language. There is a lot less of this in the UK, IMHO. Same in Canada - if you just want to limit it to politics, there are three significant parties in both countries with special/single interest parties having strong showings as well (how well the SNP or BQ would take being called such I don't know, but it's true - the SNP wants Scotland out of the UK, the BQ wants Quebec out of Canada).
The saying goes something like "don't talk politics or religion at dinner parties", hmm. Funny because they are my favourite topics (well, not really with religion, I get a bit too angry, ha).
There's also the thing where, the more something is said no matter for or against, those that are strongly of one opinion on the thing get entrenched in that position. So the more you yell "Trump is an idiot!" the more people inclined to vote for him will remember the media was talking about him, but oddly forget they were saying he was an idiot.