I have heard, and wonder if it is true, that the participants are bringing their own funds to this “Islamic dream.” If so, this is going to be hard to put your kind of kibosh on... are you proposing someone to drone every well to do Islamic family in the world?
Not a bad idea. If they’re funding the Daesh, a violent death is entirely appropriate.
Shouldn’t be drones, though. unless the targets are already in a failed state like Yemen, Syria, Libya, etc. False flag assassinations are better, as are apparent “workplace accidents.” The real problem will be dealing with state actors. Killing Saudi royals will be really embarrassing all ‘round.