One big issue is also that the victims are unable to identify perps. Consider 10-15 people surrounding you, it will be difficult to identify who grabbed your tits, who put his hands in your pants, who stole your smartphone and who was just standing there. You will just want to get out of the situation.
I predict between zero and five convictions.
Also one more thing: if there were indeed refugees among the perps, they will likely not face deportation if they have a legit claim for refugee status. This only applies for heavier crimes like murder.
Exactly, that was my point in the discussion earlier where you linked a picture of two guys.