I may have missed the mark on my point in the main post to be fair; It's not about fearing defederation from beehaw.org, it's more about ensuring we don't get overran by people with ill-intentions before the dust has settled, and whilst the site doesn't have the manpower in place to keep things like that under control.
Currently there's nothing stopping someone from the communities beehaw has defederated with from signing up here and going on a fullblown hate campaign because they disagree with the ideals of the beehaw admins. Everywhere they go, those local instances are then looking at "ih8beehaw@kbin.social", and if nothing is done to prevent that, then it colours the rest of kbin.social users in a bad light. The more bad users you get, the more likely you are to experience widespread defederation, and lose out on a lot of what should make the concept of the fediverse great.