You're trying to look at an irrational thing (alcoholism) rationally, which is much like nailing Jell-O to a tree. You're better off not trying to figure out why, because all it really boils down to is "he's an alcoholic". I'm not sure about Canada, but in the US, stealing or otherwise tampering with someone else's mail is a federal crime. The postal service takes it quite seriously. I reported my own mother for opening mail that was addressed to me (she was looking for checks or cash to steal from me, as usual).