The current problem started here.
There is only one form of Islam and the concert bomber was practicing it. Islam is at war with the West and this was the signal that it means to use genocide as a tactic.
Worldwide (and that includes the US) so-called moderates pay taxes to their mosque - a specific part of which goes to support jihadis who want to kill you and your kids, especially your kids.
Islam is not a religion, it bears absolutely no resemblance to Christianity - except in the media and the talking head dhimmis and taqyyia speakers.
This is a war, not a criminal action, the loser of which gets to be dead. As long as world leaders of non-muslin nations and their populations do not recognize this as a war, the slaughter will continue. And people everywhere will continue to watch their children slaughtered in the name of political correctness.
Delenda est Islam.