Safety is realtive
I'm sure it is all caused by relativism. Let me explain:
Being hit with a blazing fast car will only distort time, ensure certain death and be over in a jiffie and is therefore safe for all intends and purposes. Being grazed by a gentle horse with the mass of a black hole will both distort time, space and cause the burger pusher to celebrate the event for an overly long and prolonged time-dilated period and the burgers will become spaghetti-fied in the process of being in the vicinity of the massive but gentle horse.
So, car: safe, horse: danger.