Thing your forgetting here is every time the "policing" is done we mods get a 10 paragraph PM about how wrong we are/where for doing so, (sorry Pimpmann22, I know i've done that very thing to you a few times).A little less laxity could probably do the site good. Not as far as the hard-line kind of thing that was seen on roguesci, but at least a little more policing.
Also it tends to make the forums look unfriendly like.
Kinda like that ^, even though I intend to mean this as a reminder, it still looks to make me look like a prick, "unfriendly" and we don't want that.