Wait... what? Mind our own business? Then why are we on a site that puts us into other's business? That doesn't make sense to me.
How many crimes are committed and need a witness to events that lead up to the crime, during the crime or after the crime? So people should just mind their business, no witnesses in court, no witnesses for police statements. No. We need to alert, notice our surroundings, and what is going on.
And as someone that DOES have a handicap permit, it is very frustrating when you need access to easy entry into a business, and someone without a permit has parked in the limited spaces available. And guess what? The law is on our side, because it is illegal to park in a handicap place without a permit. That doesn't mean for a minute, or 30 minutes. No parking at all unless you have a permit. Easy.
I don't think someone parking in an illegal manner warrants getting shot. But that's not actually why he was shot either. It was part of the events that lead up to the shooting, that had his vehicle not been parked there, there would not have been a reason for any of the following events to have happened.
But you cannot go around physically assaulting people. It's also illegal and could result in you being shot as you don't know the results of that assault.