They come across because of laws established if they make it to the shores they will have automatic asylum. Be provided with shelter, and food etc.
As for the violence...it is their nature for those coming in are predominately Muslim....being from African culture should be obvious why their behavior is such....they come from "Tribes" who settle their differences through violence.
I understand, as best I can, through Western eyes the evil on their side. I just don’t understand why and how the Euros/West came to the point that they were so pacified, numbed, and suicidal that it allowed its own destruction. Is it our diets? Is it the history? Is it our affluence that allowed us to become physically and intellectually lazy? Is it none of these? Is it all of these and more?