Give the UK a 'sweet' deal
Give the UK a Swiss/Norwegian deal
Punish the UK
Other
I think you ignore the two facts that the CDU has moved considerably to the left and the FDP has disappeared. That means moderate right wing Germans (with the exception of Bavarians) have to decide if they want to vote for a CDU that is too left or an AfD that is too right for them. Well actually as Germans have two votes, it could be very likely that they put the 1st vote to CDU and the second to AfD.
"Wer Visionen hat, sollte zum Arzt gehen." - Helmut Schmidt
Any kind of party can tear itself apart. See Republicans, Labour, Torries. That's a tautology.
"Wer Visionen hat, sollte zum Arzt gehen." - Helmut Schmidt
It's not like it doesn't happen with the bigger parties, though a bit more rare. We also have fractions coming from PvdA and VVD right now after all. But since the parties are bigger it's less of an issue.
Nothing can beat the spectacular self destruction of the LPF thoughI think it's rare that it's accompanied with (threats of) violence!
Keep on keepin' the beat alive!
"Wer Visionen hat, sollte zum Arzt gehen." - Helmut Schmidt
The thing with populist parties here is that they grew quickly and had (very) bad candidates as a result and no internal mechanisms to vet or select people, which is why the LPF imploded after Fortuyn was murdered. And with Wilders.. his party isn't a party, really. So no internal mechanisms either, Wilders is essentially the dictator of the party and the other 'members' were just allowed to follow whatever he decided, which caused obvious problems. The more established parties tend to settle their problems during conventions etc.
Keep on keepin' the beat alive!
As I have some experience in active party work I can tell you, even a moderate party will attract suspicious people that have strange opinions. You have mechanisms to throw them out but it's always a headache. These kind of people are usually very narcissistic and have problems with self reflection. They will do anything to prove the other members that they are correct, and they just need to understand his position. And as soon as someone like this holds a seat, he finds himself in the right, as he was voted by "the people".
"Wer Visionen hat, sollte zum Arzt gehen." - Helmut Schmidt
But at least you have mechanism to kick then out or keep them from electable positions, over here it was more of a 'we need to fill the seats so we'll take anyone', and that didn't work out well. With the bigger parties that tends to happen more at the local than the national level.
Keep on keepin' the beat alive!
That mechanism are not easy. And the party always gets bad attention in the process of kicking someone out.
"Wer Visionen hat, sollte zum Arzt gehen." - Helmut Schmidt