We've got a milk delivery service and I am habitually awake late enough at night to hear him turning up at our house.
Ernie (for it must be he) comes tearing up the road (residential estate sort of thing), actually screeches to a halt outside our house, delivers the milk all fine (never had a cracked bottle or anything) then takes off as if the hounds of hell were after him.
It doesn't bother me too much in terms of noise and speed on a quiet road at a quiet time. But there are a lot of cats in the area, including mine, and I tense up the whole time I hear him driving, stopping and tearing off because he's so likely to kill one of them one night.
YABU: ffs have you got nothing else to worry about, he's probably on a tight schedule
YANBU: Running over a cat because you were going too fast is stupid and irresponsible