Actually, most people fall into the moderate spectrum. It's just the fringe loonies that are VERY vocal about their position. And with the internet, you get to hear from them a lot more than you used to.
I'm sorry, that's just not what I'm seeing, at least on the conservative side. I don't see it on the liberal side; those people seem reasonable to me, but then again I don't hang out with college-aged people, and everything I'm reading about that crowd is pretty scary. On the conservative side, I'm seeing friends and family members I've known a long time buy into the stupidest crap straight out of right-wing news. This wasn't a thing 5+ and certainly 10+ years ago; it's all new thanks to the alt-right Facebook groups and news sites. Middle-aged people who normally are against the war on drugs and are pot smokers are big fans of Trump and Sessions; it's an utterly amazing display of cognitive dissonance. When pressed, they really think that Sessions will "come around" on the drugs issue even though all evidence is that he's a hard-line "tough on crime" and anti-drug (esp. anti-pot) ideologue. People who are highly religious are all for new right-wing/Trumpist policies like repealing Obamacare and shrinking Medicaid which people in their own families rely on to have healthcare. In fact, it's utterly amazing how the Christian conservatives/evangelicals have rallied behind Trump, someone who is obviously only religious about being greedy. AFAICT, a lot of this comes from a reaction against society's growing acceptance of homosexuality, and also against immigration. For some, it seems that nothing is more important than "getting rid of the Mexicans", and they're happy to sacrifice all their civil liberties and freedoms for this cause.