The systems of government are all sectarian, based on Islamic Sharia law and wide open to corruption as a way of life.
It means that whoever is in government will be opposed vehemently and violently by any peoples who follow any of the other Islamic sects. Those in power will use all means to oppress and eliminate the opposition and gain justification from their religious scholars who will call for Jihad.
This system of government can only exist if the governing body rules mercilessly through virtual dictatorships and instils abject fear in it's population.
Without it, civil war ensues as one sect fights against the others to dominate and the cycle continues.
The general population who simply want a peaceful life are doomed to an existence of continual fear, oppression and war/potential war with acts of terrorism. Given those choices it's little wonder that Muslims in these countries want a safe existence in countries with strong democratic liberal governments and strong economies.
The tragedy is that the refugee crisis is seen as an easy bandwagon for economic migrants to jump on. This is coupled with a laissez-faire societal approach to integration where immigrant population centres cuckold indigenous populations and grow increasingly brazen in their demands to establish their own culture including it's sectarian baggage.
Islam means 'submission' and an unnervingly large percentage of the diaspora assumes that includes their new home and the indigenous people who welcome them in.
Merkel's heart is in the right place, but she is incredibly naïve in her approach. The dithering inertia of the EU is being exploited before the door slams shut. Islam in the west needs to get it's act together and openly promote secularism as the only way of government ahead of anything to do with religious ideologies.
It's ridiculous to assume that Sharia and elements of it can be allowed to co-exist within a western liberal democracy. It's a privilege not a right to live in the west and people who want the benefits offered must and have no option but to accept liberal democracy with all it entails as the fundamental test and legal conditions for entry.