Self-defense is a constant, dependable seller for your store. Capitalizing on this fact of life, because it’s not a trend, doesn’t make you a bad guy. If you’re able to provide ammunition, pistols, accessories or other things the customer wants, that’s merely good business, whether it’s for recreation or self-defense at home or away.

There’s no argument about whether interest in self-defense has risen in the last decade. Myriad factors have influenced the increase,...