In nature, predators usually only target sick, elderly, separated and weak animals even though they are capable of taking on healthy adults. That's because a simple injury can terminate their life. People are no different.

Looters are no different. Some gun owners might imagine this post-dystopian world with roving gangs of people lead by guys named "Negan" going door to door to take the wimmen's and the food, but it's nothing more than a fantasy, for the same reason that some liberals imagine a post-gun world where all guns have been confiscated door-to-door. Unlike older forms of pillaging, firearms are a great equalizer and there's only a select number of houses a looter or even a mob of looters could sack before they ate lead, and they are quite aware of that.

So, they go after unguarded stores, things that are 100% safe from eating lead. If a bunch of koreans are on the roof with guns, they give that a berth. Life isn't a Netflix series, even the "bad guys" aren't too keen on risking their neck. If you're genuinely worried, just take down any signs that say "this house is completely unoccupied and unprotected and you won't risk your life by breaking in!". You know, like a bunch of faded "Hillary 2016" signs left in the yard. Don't have that? You good.