For many people, guns are used for sport (hunting). In rural areas, this is very common. Some people are just paranoid and feel the need to be armed. It’s not stupid in its own right. If the owner of the gun knows how to secure it properly and takes the appropriate precautions, it can be safe to store firearms in a house. The problem is that too many people who own guns let their egos get too big and are neglectful of gun safety or downright stupid. That’s when problems arise.
There is real nuance to this issue. Don’t try to dumb it down to “gun owners are idiots”.