> I don't want a ISIS member coming back to the UK.

A lot of ISIS members came back, they faced persecution, some even death sentence but none had their citizenship stripped.

https://www.nbcnews.com/news/world/u-k-strips-citizenship-is...

> If they were born in the US, they would have just been assassinated by drone strike instead like they did with Anwar al-Awlaki.

Yes, but the point is, is there are a legal treatment which is different for people who have been living here for generations vs those whose parents became a citizen in their lifetimes.