When I steal a shoe, the shoe can’t besold anymore, because I have it. If I pirate a game, is there one less copy that steam can sell?

Piracy is categorically something else than stealing. Have you even read the original post?

Edit: If you really follow your logic strand, you would have to reach the conclusion that Sony stole content from their users.

Edit2:

No, I never said anything of the sort.

This u?

The origins of any movie you pirate come from theft, full stop.