Sorry about being gone for 2 weeks: Lot to do as I did my regular work. But to continue about cars and the danger therein.
Get a locking gas cap. I know it’s inconvenient. But if someone wants to be a pain in the tush, all they have to do is pour sugar (it takes more than a spoonful but I won’t say how much) into your tank. It won’t take long before you have a major engine problem on your hands. Or if they *really* want to be malicious, a ping pong ball in the gas tank will cause you to stall out and is almost impossible to diagnose without taking the gas tank apart.
There are also other, more malevolent tricks with gas tanks that I won’t describe that can make the car go “boom”. So a locking cap is a good thing.