The main problem is that they want to transform the european countries that took them in the shitholes from where they originate.
So in that case ...f**k them!
Some want to actively do that, and are coming for that purpose.
Some of their enablers also actively want to do that, out of self-hatred, as a way to take revenge of for they perceive to be unjust/cruel/etc... the whole "I am white and this is bad, my entire race deserves to die because of what our ancestors did to you ages ago!" self-flagellation.
But it is also a process that occurs organically, in the sense that a lot/most of these migrants are defacto unable to assimilate within the society they landed in. They don't know the language, the customs, they don't have anywhere to live, etc...
So they stick together.
And by sticking together they create diaspora and enclaves that grow with time. One generation passes, then another, then another, all of them living together without mingling too much with the "outside world", because they don't want/need to, and you end up with a Bamako 2.0 right in the middle of some French provincial city in Normandy.
But yeah, let's put UK citizens in prison because they posted a tweet some people will get offended over.
Imagine what will happen if the British police discovers Reddit!
You want vile? You want degeneracy? You want murder fantasy? You want outright calls for culling and genocides?
Ah... wait... nevermind, it's aimed at white people, straight people, Christians, Conservatives, etc.