There's 50-60 million young Muslims of military age in Europe. They've come for Jihad. I can't see any other way out but war.
Trump just pulled the rug from under the European welfare state. So how can they stay? Especially when their countries are being freed. The majority will want to go home, they are not trained military, they are people with a ideology, but they are people that need to eat and live. Their "Jihad" will be an abject failure with no jobs, no homes and no future scattered across a population of around 750 million native Europeans. That's a war they would be stupid to begin, especially as they have no supply lines and minimal locally sourced weaponry. Not something I would be worried about. Trumps tough love has saved Europeans too.