What cross-grid griefing? Is there some proof of this? I personally only know of one person who said they were from osg come to one of my regions and try to cause me issues. I mostly ignored this person and ejected/banned them when it became clear they were just trouble makers.
I have seen much worse elsewhere.
Griefing in anything but sl is largely a non-issue and owning our own regions makes it a simple thing to deal with, for the most part. We don't have to wait on some admin to baby-sit us to safety-))
The hg block is silly and self-defeating. To my thinking it is only just some hot heads trying to show they are the king of the block. bleh, give 'em all some shots of estrogen to calm 'em down a bit-)))) Have 'em walk around naked for a while-)))
HG blocks are simple to overcome anyways, I do not see the point. All ado 'bout nothing.