I'm pretty sure European Leftists have been so excited by the prospect of finally getting back at Dad and The Church that they haven't really thought the end outcome all the way through.
I agree, it’s not a well thought out plan, but there is certainly a plan in the works.
They haven’t considered how zealous many middle-east cultures are with settling grudges and vendettas, some based on events thousands of years ago, if the events ever even happened at all.
As Golda Meir said “The Palestinians will have peace when they love their own children more than they hate Jews.”
For the most part, that has not happened yet.