I've had some of the most odd actions come from players recently, I warn the players that what they are proposing isn't a "good" action and get looks of confusion from across the table.
Now we all know the player doesn't have an alignment, or a clearly defined moral code for that matter, but trying to kill a subdued, unarmed, bound person is not "good"; no matter how you spin it.
Characters have an alignment listed on the sheet, and I'm even willing to give some leeway in situations. (The CG dwarf who wants to kill the tied up goblins. OK, chaotic nature and dwarven racism toward goblins.. sure kill em, but you'll feel bad later.)
Asking a beaten, shackled, mistreated person "What will you give me for freeing you?", is not a "neutral" thing to do. (How someone defines neutral is a discussion in and of itself)
Playing an evil character in Society isn't allowed, but having an occasional character who walks the line is fun. An entire table of self-centered, thieving, blackmailing, murdering thugs week after week gets ridiculous.
I have a character who follows the law and this has gotten me called a paladin multiple times, and that makes me laugh (but I would rather cry). Every character around my tables seem to be lightly medicated psychopaths desperately in need of some therapy and a nice fluffy teddy bear.
