I have nearly enough guns, although there's no such number, really.
I have a couple that would depreciate in value if shot; I'd prefer not to shoot them for that reason. I have a few that are so old I'd never be able to find parts to repair them if something snapped; they're attractive specimens, so I'd rather pass them forward in functional condition, given the choice.
The others, I have no problem shooting.
Everyone faces choices; do what you think is proper, and don't criticise someone because their choices are not yours. Circumstances, and people, vary.