Trump is what people in the 90s called a centrist democrat. Progressive in some ways, traditional in others. The thing is, "progressive" once went from "cares about social issues and their impacts" to full on blown communist authoritarianism sometime after 2008.
There is immense social pressure as multiple levels of society for people to be 'liberal' lest they be ostracized from the social group. The drive to be part of the tribe is a strong one, hence the strange behavior from a lot of modern liberal groups.
Cultural Marxism has evolved to such a point where being born white is now effectively considered an unforgivable "original sin", with no recompense. This is the very definition of racism, but whites as a whole are so afraid of being considered racist thanks to the 'progressive' social programming, hardly anyone speaks up.
The name floating around the net for these "rogue progressives" is called, very accurately, the regressive left- for them to continue their course of action is to destroy much of what has been fought for for decades, if not more. Race relations are effectively at 1960s levels, families are being destroyed, mental illness celebrated; the list goes on.
People who used to consider themselves liberal now fall solidly into republican territory. When you lost your job to outsourcing, and blue haired SJW's are yelling at you to check your privilege for perceived slights against a gender that until a few weeks ago didn't even exist, it's not hard to back the guy who is rich enough to say "fuck you" and not have it affect him in the slightest.
If Trump cared about legacy, he could pull an Andrew Carnegie, donate money to all the right places and get piles of libraries, schools, and park benches named after him.
tl;dr, he's not perfect but compared to Hillary, we stand a chance at reversing some of the cultural damage that has happened over the past 10 years.