Noisy quad bikes are a feature of vibrant multicultural areas. Also, very expensive cars, Ferraris, Lamborghinis etc. (they hire them), being driven around the streets at high speeds. One night the other week when it was very hot, one of my have-a-go neighbours went out out remonstrate with a load of *****. It just made them worse. The police were called, and were seen about 3 hours later driving once down the street, after all had quietened down.
As I've said many times, low police numbers are not the problem. The problem is lack of punishment.