Well, that's certainly not news.
Any group that's killing for an ideology is going to strive to outdo the others.
I don't know about it being a Muslim thing though, it may be simpler than that.
Perhaps it's because the U.S. has been involved in armed conflict there for the last, what? 15 years?
Put a hundred thousand troops into Africa and I'd bet Boko Haram would be making larger headlines than they currently are.

Motorcycle racing and bull riding are the only true sports, the rest are just games.
-Hemingway.