Don't think it had to do with her being from Arkansas.

Well they are wearing masks, maybe even a hoodie. No reason to not open fire

Keep in mind this happened in Little Rock, Arkansas. I don't know where it ranks currently but it wasn't very long ago that Little Rock had the highest murder to population ratio in the nation.
Although we may know their actions after the fact we don't know if this person did or not. Evidently there was a group, gang, of them. This girl may not have had a gun but that is generally not the case when dealing with a group of teens.

another zimmerman

...which leads me to my next point, leave peoples cars alone. Messing with someones car can be messing with their livelihood, which can lead to a pretty angry response.

Yep mayonnaise on a car requires deadly force. No question.

I'm assuming, dark, and he couldn't tell what they had done or were doing. Just that they were f'n around with his car.

Kids just trying to work in some exercise

If they had used Miracle Whip instead of Mayo, young Adrian might still be with us.

It's just too bad Bieber didn't decide to egg houses in Little Rock, Arkansas.

this ^^^^

What else was the guy supposed to do?

You have to shoot until you aren't scared anymore if strange folks are on your property.

He'd be charged if he were white. He'd just be found innocent by a jury.

They need to send the home owner to the Country Club Plaza in KC. For every troubled yute he takes care of, a year gets knocked off his sentence.

Middle of the night, you hear people outside your home messing with your car, step outside and start having objects thrown your way, again, in the dark. That's seems like a pretty good excuse to start shooting.