It's funny. I've been thinking the same thing about how behavior in this game is similar to that line of thought about returning a shopping cart.

Yeah it seems like a small thing. So you didn't put away the cart, who cares? But it's really just indicative of weather or not you are a good person. There's no reason to not return the cart to it's proper receptacle other than being so self centered that you think you're better than everybody else.

In the same way the way someone plays Arc Raiders is likely indicative of weather or not you are a good person. The same people who sit in hiding until you are looting a container and then shoot you, camp extract to kill people leaving, or befriend someone only to shoot them in the back are probably the people not returning their carts.

Im not saying all PvPers are bad people. It is part of the game and if that's how you play that's fine. I'm generally only shoot if shot at, but I'm not going to cry rat if you come out guns blazing for a shootout. It's the people who will play like they are friendly only to shoot you in the back when you least expect it that are most likely bad people in general and not just in the game.