Not random or senseless.
There are plenty of great large dogs. My boxer was a gentle giant but would rip the throat out of anyone trying to break into our home. I would put the kids in the back bedroom and told any workers to not go down the hall. She would lay infront of the door and only stand and growl if someone tried to go down the hallway.
She was well trained and I never had a single incident in all the years she was with us until her passing at 15 years old.
There are lots of horrible large dog owners. Their dogs attack people, other pets, they leave behind huge steaming piles that owners don’t clean up, they don’t train them or let them get loose. Unlike little dogs, a large dog can easily maim or kill someone. Somehow, these owners refuse to see their own shortcomings and blame everyone except themselves.
The worst kind of idiots are the ones with dangerous breeds that, after being cited for biting someone, are shocked when the dog bites again.
Dealt with plenty of lousy large dog owners throughout my career.
These rules didn’t arise out of thin air. They became widely adopted because too many bad apples spoiled it for the bunch and property owners were tired of being sued.
the rules are random and arbitrary and should be written based on owner responsibility ONLY and NOT on breed or size.