Having a small penis doesn't make you a bad person and being a bad person doesn't shrink your penis. Let's stop shaming people based on things they have no control over, such as skin color, sexual orientation or penile length.
My favorite thing for these parking lot issues is just folding the passenger mirror in. Non destructive, annoying, and the owner almost never notices until they have at least gotten in the vehicle, if not already moving, and have to stop, get out, fix the mirror, and start the whole "go" processes over.
Oh, threatening other human beings now are we? In that case have fun when you start your car... maybe don't park in easily accessible public places, it may be bad for your health. Just a safety tip, I'm not gonna do jack or shit, but other people aren't in the military and some of those ain't got nothing to lose.