It is one thing to be vocal it is another to be physical. In this case the migrants need to police their own people. If one of theirs is involved in theft or sexual assault they need to be the ones that bring the offender to the police. This will show that the migrants wish to live in a civil society as do the rest of the people.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Living in dread in south Tel Aviv, young African migrants feel the hate