And what's wrong with the economies of their native countries? Why do those countries not provide equally generous benefits?
Which countries are we referring to? Pakistan, Afghanistan, Somalia, Nigeria, Syria, Lebanon, Libya, Morocco, Thailand, Phillipines, China, Russia?
The list is endless. So then we have to differentiate economic migrants from refugees, it doesn't appear that the EU is willing to do this and is letting uncontrolled migration run its course.
There are theories that the economic reason may not be the real reason and that the real reason is to promote the Islamic ideaology.
It's difficult to comprehend why migrants that have decided to move from their home countries for economic reasons, would go on 'the rampage' in their adopted countries, even though they are offered the chance to integrate and live peaceably amongst the host countries.
Why do they rampage, why the bombings, why the rape, why the crime? Why the lack of control by the authorities, why the open door policies?
Why do you think they migrate?