> Perhaps even just some sort of union of all the European countries to jointly and equally share the load when refugees come.

Why?

> Isolate them on islands...

Why not? https://en.wikipedia.org/wiki/Palm_Jumeirah / https://en.wikipedia.org/wiki/The_World_(archipelago) , otherwise Malaysia and Indonesia come to mind.

> ...in concentration camps?

https://en.wikipedia.org/wiki/Mina,_Saudi_Arabia <- looks comfortable. Tents even have AirCon and ability to cater for masses is proven already.

Or https://en.wikipedia.org/wiki/The_Line,_Saudi_Arabia ?

In other words: why should what happened in Islamistan not stay in Islamistan? (cf. https://en.wikipedia.org/wiki/Ummah )

Let them fuck themselves. As they always do. No need for 'the (non-islamic) world' to support that.