Guns are easy to get, they’re portable, they’re easy to use, and they are stable and safe to operate. Bombs are pretty much none of those things. Bombs are not sold at your local Walmart or sporting goods store, they don have weekend bomb shows at your local convention centers, they require some skill to make, the raw ingredients are tracked at point of sale, and to have the same casualty count tends to require a large amount. It doesn’t take much reasoning to understand why guns are the goto choice