These killings clearly show why Islam is so dangerous, and spreads so successfully. Can you imagine hundreds of thousands of Christians migrating to Saudi Arabia, with high birth rates and a desire to build churches and spread their faith? Of course not, it's unthinkable, even if the government of Saudi Arabia allowed it, because the populace of Saudi Arabia would kill so many immigrant Christians on their own (even without gov't guidance) that Christinas wouldn't dare to settle there. But millions of Muslims have entered the U.S. and Europe in just the past few decades, and these individuals and their offspring don't try to assimilate, and don't bother to hide their plans for conversion and eventual dominance.
There is a serious "passion gap" between the West and Islam, to go with the tremendous variance in birth rate. Together, they spell big trouble for us.
The bottom line is that the West is giving up its crucial geographical "Zones of Dominance" while our enemies and likely enemies (Islamists, Mexicans, Chinese, etc.) are retaining theirs.