2 Things they do produce
1, Lots Of Terrotists
2, Lots of Hate - As Most of the rest of the World Hates Them

I really hate to say this but, even though there some good Muslims that don't strictly follow the religion, on balance they contribute little good and make this world a far worse place. In other words, this planet would be a much better place if Muslims never existed. I can't say the same even for Blacks.