Stupid people steal and stupid people cheat. These people know they are stupid, so they can’t have a witness when they do something they think is smart. If they think they are out smarting someone then they think they are smart, but nope they are stupid.
Of course they are stupid, that is why they have to sneak.
Stupid people try to outsmart people to prove they are not stupid.
A self gratification that will never be fulfilled, that is why they continue to do it and eventually regret it.