There are two reasons to own a gun. 1) to kill animals. Hunters need low-capacity rifles to kill animals, and sometimes also low-capacity handguns for protection from other animals. 2) to target shoot for fun.
The number of "goods guys with guns" who use them is tiny each year, to the point it almost doesn't happen. It's absurd to justify a firearm purchase as "protection." You didn't buy it for that reason, you bought it because you thought it was cool and it's fun to shoot. Just be honest about it.
Have you done either of those things? ---
"We're not even close" - Romans building Rome at the end of Day 1