It's not the dogs' fault, but the fault of irresponsible owners:
Letting the dogs out of his yard
Poor training
But, as usual, the dogs may end up paying the ultimate price.
The point is that not all dogs respond this way when they're out.
My dogs have on occasion managed to get out but it was entirely a mistake by my wife.
They didn't harass anyone or bother a sole, they just ran down the road all happy to be out and then came back.
We found then sitting at the gate after going out to search for them.
In a total opposite experience though, one of my dogs had mental issue and as she approached adulthood she started to become very strange.
So much so that one day she attacked one of my son's friends while they played in the garden.
She didn't just give him a warning either, she went after him.
My wife was hitting the dog with a frisbee trying to get her to stop.
Only I could get her to stop and by then the child had been bitten in the face.
We had no choice but to put her down.
Sometimes you need to be responsible as a pet owner.
I still miss her every day but I don't for a second think it was the wrong decision to make.
I could imagine her happy but also imagine her mauling someone to death.