You are naughty.
Seriously, I might not be able to pick off all of them in the yard, but with my wife using the AR (or the AK) and I with the pump shotgun, the fact that we have only two entrance doors (the garage being secure from that sort of intrusion), the bodies can pile up on the doorstep(s).
In a rural town with 12K people (in a gun friendly state), it's not likely that roaming gangs would be primarily a racial division thing. Most of the people, black or white, would be hunkering down.
Also, in that scenario, the thugs would not have the benefit a hamstrung police force limited in their response. I'm thinking we locals would permanently take out the majority of the bad boys. Thugs are cowards usually. If they are not in the superior role, they aren't staying around.
I think that rioters sense that there would be a lot of vigilante action if they did go after 'whitey-town'. Most Americans don't stand around waiting for the govt. to do what's necessary -- they do it themselves.