You can trace it back as least as far as Barry Goldwater and the rise of right-wing “think-tanks” in the 1960s which came as a backlash to the civil rights movement and the perceived dominance of left-wing politics in government. Which led to Nixon’s “Southern Strategy”, right-wing talk radio, Fox News, and the ongoing brainwashing of much of rural America in particular.

I don’t think Bush ever sunk to the depths of the Hitler-like rhetoric that Trump and his cronies have been using, however. Maybe the guardrails will hold if Trump wins again (or loses again) but this is not normal.

Non-voters are complicit in what is happening. Maybe saying they are as bad is a stretch, but they clearly either don’t care or are ignorant about it.