re: How did it come to this?

No, I'm pretty sure it was a mixture of the constant unfounded accusations of racism and xenophobia, the repeated suppression of dissenting speech, the overwhelming executive overreach, the disrespect for police and military, erosion of the American culture, the deliberate erosion of the middle class (vis-a-vis obamacare, overregulation of industry, increased tax burden on the middle class, et al), the deliberate reduction of American power and influence on a global scale, among many, many others.

Seriously, the SECRANT servers don't have enough space to list that scumbag's failures. The typical fringe leftist is too fricking stupid to understand the difference between racism/xenophobia and dissent against catastrophic policies.