I think there may also have been some limits imposed on players trying to kick over sandcastles without having their own, which seems very sensible to me.
Yeah, it's never the actual "two groups at war" that are the problem, some of the things in the old BGS always seemed to be stupid, petty drama being dumped on a small-medium group that just wanted to be left alone and get on with their little single-system empire, like "some member of the group had a falling out over some stupid drama and decided to flip the table on the way out" or "these guys left my group and set up elsewhere and I'm mad about it", or in one case I know of, "this group advertise themselves as lgbt-friendly, their existence upsets me".