I've wondered about that, too. Some clue comes from my estranged SIL, in her never-contact-me-again screed. She hates us because we voted for trump, think climate change is a scam, hate gay people (some of our best friends are gay), and so on. I think the leftists thought with Obama, and Hillary to follow, that that would be the start of a 1000 year socialist "reich." Trump upset the apple cart and trashed their delusional vision. Their hate, being amped up by the MSM, simple causes their head to explode. If Trump wins this election, and I think he will, it will be fun watching them scream at the sky again.