Policing is part of the preventative measures. As are IDs, communication improvement, vetting and allocation of the correct resources is social services and medical resourcing.
One part is making sure the immigrants aren't part of the cause of the issues that they are fleeing.
Another is to help the new arrivals steer clear of groups that will take advantage of them from low level criminals to bosses exploiting labour.
If all the new associates are the current societies pariahs rather then upstanding law and order types like good police then who do you think the noobs are going to pattern themselves on?
Society cannot expect people to passively integrate in the most positive manner. They will naturally conform to a range unless prompted otherwise. Even with good measures their are undesirable outcomes in every society.
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