It's probably related to what was once, in antiquity, considered a threat to the tribe, clan, community, etc.
Homogeneous societies are able to arrive at a consensus much easier on things such as this, for that reason.
But we're a mixed group in here, from all over. We can only agree on what the rules are as they are and abide by them to remain in good standing here. We can influence the rules a bit (Suggestion Box and Feedback), but it's up to the owner to decide what's up.