I have changed my mind on this. My new opinion is, fuck 'em
https://www.bbc.com/news/world-middle-east-47286935
"Researchers found 18,852 came from the Middle East and North Africa, 7,252 from Eastern Europe, 5,965 from Central Asia, 5,904 from Western Europe, 1,010 from Eastern Asia, 1,063 from South-East Asia, 753 from the Americas, Australia, New Zealand, 447 from Southern Asia, and 244 from Sub-Saharan Africa."
40 000 foreign fighters travelled to Syria to fight for ISIS.
More than half came from other parts of middle-east or North Africa, ie places in not much better shape than Syria. Those will all be able to go home.
That leaves 20 000. We don't know how many are dead. But it says a majority are dead or in custody. Let's assume they're either dead or will all be hanged for war crimes. It's a safe bet.
That leaves 10 000.
For those who joined ISIS as teenagers, like Shamima Begum, I say instant pardon and bring them home. Teenagers do all kinds of dumb shit. I'm guessing that's half of the foreign fighters.
That leaves maybe 5 000. That might sound a lot, but in the big picture it's not. I say, fuck 'em. Let them drift around the outskirts of the world.
These are all people who knew before leaving that ISIS committed atrocities. We've all seen the same videos. They were promised to make up an elite in the new state. So they clearly felt other people's lives were worth sacrificing for them to live lives of luxury. Sorry not sorry.
I was earlier under the impression that we'd have to deal with millions of ex-fighters and their families. But it's so few people that it's not worth bothering about. Let them perish. It's a shame about what happens to their children, but this war has left at least 100 000 orphans in Syria. They can join that club. I see no reason to give the children of the fighters any privileges we're not also extending to the rest of the orphans, ie those orphaned because of their parents war crimes.