One side is filled with anti-democratic monsters and captured by corporate interests. The other side is just captured by corporate interests. For sure not equally bad, but that doesn't make one a paragon of virtue.
You are always going to have crazy extremists on both sides: be it Trump-truthers or socialist “China did nothing wrong in the last 50 years and Venezuela is good for poor people” leftists.
Majority of people tend to be more centrist, but that doesn’t get as many clicks / ad dollars.