Why do we allow it, is the question.
Where I lived in Germany, small town-maybe 5,000 people, no stoplights and a bridge into the town that only one car could use at a time-there were probably 1,000 muslims. They would rent out entire apartment houses for themselves and you could always tell who lived there. The Germans keep their yards impeccably clean. These houses would have trash all around the house, old matresses out in the yard, raggy old sheets for curtains, shampoo or soda bottles in the windows. Just gross.
But they always had cigarettes and cell phones, go figure.