Mearly a man who has studied history, and knows that it is much easier to destroy than to build. Blowing up the GOP may be fun, but making a viable party in our current system is almost impossible.
Do you want ten to twenty years of uncontested Dem majorities in order to pee on the GOP?
If we have to sit out of power a few cycles to purge the party of them, it's worth it in my view. There's no difference between having them in the party and us sitting out elections anyway. They virtually always vote with the Des anyways.