They won't do it. They all supported Adolf, and fought against democracy. They're just making this claim to give the impression that their party matters. It doesn't. Even if they did form a new party, their actions and ideals wouldn't change. There would be no difference from how they are now except what they call themselves. The appropriate name for them would be Fucking Retards if you want to put it mildly. No offense to anyone with mental and cognitive difficulties. I have several of those issues myself.
If they really want to get behind this country there already is a party they need to join. The people already in that party are called Democrats.
And for those who try to use the "Democrat ends in rat" as an insult, I say thank you!
Because if you knew anything about rats, you would know that they live in colonies in a nest. And there's a patriarch and a matriarch. They run the show. But all the other rats are finding food, defending the colony, and maintaining the nest. They work together to survive. They all take care of their young. They support each other and live together mostly peacefully.
So to call us rats, is actually a huge compliment.