UTR, you have a sick, twisted, cynical mind.
And, yes, I was thinking exactly the same thing.
I was also thinking of the Dangling Participant Theory of Moron Assassins. Get a moron or two to commit the deed, then stand back and see the ripples. And then, as you say, "next time-!"
This could also be a Pure Lee Harvey Situation as well, done all by themselves as a result of growing up in Chechnya where bombings and murders of school-houses and ballet theaters are held in high regard. That environment even makes Jerry Springer look tame.