You're not getting the point. If someone you trusted asked you for the password to some trivial account you can't even use anymore but they can, would you give it to them?
A Steam account doesn't seem so trivial, if that's what he gave out, I don't know, it's what I heard. Anyway, no, I wouldn't, even if I couldn't use it. Because it has all my games on it, and i'm assuming spock had games because he could add friends.