Really? No method? How about this, genius:
There are STRANDED MIGRANTS at borders of Greece.
There is a huge amount of migrants still aiming for EU.
Why? Dear Frau Merkel opened up her big mouth and called out to Syria and technically each and every poor country around Africa and said:
"Come over, have some free money and living!"
Now... life in Europe may not be as bad, but you still have to work and EARN the money.
1. Disillusionment of those who got through, going after the vision of new El-Dorado and "Free lunch with cake" -> Unrest INSIDE EU.
2. People travelled a long way, now they get stuck at the borders. I don't know about you, but I'd be VERY angry. Mind you, we're talking about nationalities to whom physical casual violence is fairly common. They will be VERY angry and feel VERY cheated. For now, it's calm. But some of the people who got there, paid money, lost their family members in sea and who-knows-what-ordeals. They need to eat, places to sleep. And winter is behind the door.
3. Those people, who aren't actually refugees, will be quite angry with Merkel. Maybe they'll feel like taking a small revenge. Not all of them, I grant you. But many will.
Do I need to paint you a picture? Really?
Ok, potentially MILLIONS fresh ISIS members. Or allies of ISIS. Doesn't actually matter, which.
Good job, Frau Merkel. You quite probably killed Europe, since we cannot allow genocide, but the other side doesn't share your moral convictions.
You do remember, that Chess actually came from muslims?