I think its great that he's leaving the Republicans. They've clearly lost touch with their values and beliefs in the past 21 years.
OTOH, its a damn shame he had to join the Democrats. They care even less about the future (or the past) of this nation that the Republicans and that's saying a lot.
It would be really nice if he could have switched to a party that believed in the Constitution, the Bill of Rights and in particular, the 10th Amendment. But, of course, neither party does.
I'm a Democrat, and I care a great deal about the future and past of this nation, as do many of my Dem friends.
I don't think such broad generalizations as you've made are often helpful or true, but more often inflammatory. If fanning the flames of polarization is your goal, then you are likely to succeed. But if engaging in respectful, intelligent discourse, or seeking to understand points of view that differ from yours, or working perhaps toward a path to consensus or compromise is what you're after, I don't see this approach as the way to get there.
And foolish!