I can't believe you actually want more regulations; life is already overflowing with them, and with luck, the arts will still continue to manage to defeat them.
However, if you mean that one should not photograph people in a mocking or insulting way, then I agree with you, though you will still have to face the fact that one man's mockery is another's sense of humour, and you don't even need images to discover that.
How on Earth would you regulate such a rule of etiquette other than via self-regulation which, of course, opens the entire thing up to personal interpretation, as I just indicated a second or two ago?
However, perhaps you mean that from a strictly LuLa perspective, in which case, you might be suggesting that a Moderator be lumbered with the task... I don't think (hope) that will fly!
:-)