they do it to protect their members. I mean wouldnt you be upset if someone started ar'ing you because you SA'ed them and they coulndt break you? Or aa'ed you and then grabbed you?
Would you really accept that as normal play? You could keep aa'ing eachother and grabbing eachothe back for so long until you realize its futile and just war eachother to stop one of the other.
LoR put out a policy that was similar to old unwritten rules but not exact.
Plus whats the point of the other attacks out of war? You gain nothing from ar'ing ga'ing unless you intend and do kill that state.