Thinking about this some more, at least some of it is because, on the whole, people want the game to continue, ideally at least vaguely in the direction that the GM wants. As a consequence, consequences aren't what they should be, and thus it's okay to behave in particular ways. Likewise, getting IC consequences for actions is very difficult and GM dependent (never mind the CRs), so there's no enforcement there either.

If you can't make the next forum when I arrange it, prod me about this? It's worth discussing properly.