Because I guarantee you that murder and rape and other violent crimes which you claim polygamy increases are much higher in the U.S. than in almost any Muslim country. Have you ever been to East St. Louis, for example?

Also, with regard to Hamas and Hezbollah, I doubt that polygamy is all that common in Palestine and Lebanon, so that analysis is pretty much garbage.

However, the link between sexual practices and violence is probably strong. The reason for the higher levels of violence by young men in the U.S. is probably strongly connected to the mutual jealousy and lack of trust between genders that comes with the exercise of sexual 'freedom.'