I've said this before (and dead0man always ignores it), but here's something many miss: It is possible to think Trump is a Horrible Person and yet still enjoy the nightmare he's causing for the Republicans. The Republican establishment are not a group of people I would ever be able to muster any sympathy for, even if I was more conservative. Similarly it's hard for me to think "Oh poor Jeb/Christie/Rubio having their possible nomination stolen by this lunatic"
There are people here who seem to think that politics is like a sports game, and that you should respect the "other team" and not get gleeful about things like injuries or whatnot. That's simply not the case. Come February 8, there will be no real impact on the world based on whoever won the Super Bowl. Some people will be very happy, some people will be very dissapointed. They'll all go on with their lives. That's not true about November 9. Similarly ridiculous is the idea that the "mainstream" Republican candidates are good respectable people and even Democrats should show view them as respectable opponents, unlike Trump. Not only has that way of thinking not been the case the last couple elections, it never has been.
Trump poses a severe threat to a group of people with zero moral standing, and zero interest or concern about anyone other than themselves and a small elite. You can say the same is true for Trump himself who cares about nothing but inflating his ego and getting attention. That's probably true. But I'm not going to mourn something that only hurts a bunch of also Horrible People, likely increases the Democrats' chances of victory, and creates a far more entertaining election. The chickens are coming home to roost, and I don't think any Democrats have an "obligation" to somehow try to prevent this, or at least not cheer it on.