I'm the first person to say that the Democratic party sucks and is inept and often screws itself over and isn't much more than Republican-lite.
But I don't think Trump's win (or the general control the GOP has over the government) can be completely attributed to the Democrats incompetence. Truth be told, during the Obama era a lot of people got drawn into this alt-right movement (there was a thread about white guys getting radicalized online) and having a black president made that easy to do. Trump's rise is reflective of that. Keep in mind that Trump is a guy who spent years claiming the first black president wasn't born in America (for no real reason other than him being black) and most of the population was fine with this (at least fine enough with it to still vote for him).
So I guess my point is that, as bad as the Dem party is (and it
is bad), at some point you have to admit that a lot of the reason Trump won is because a large part of the country likes him and his rhetoric.