There are a couple of issues.
First, airing out grievances between two individuals in the open can start flame wars and lead to animosity among the player base. That is the main reason it is frowned upon in most games. It is very rare when this is conducted civilly leading to rivalries rather than all out douchbaggery everywhere. Secondly, in order to be effective, the scumbags need to care about the opinions of the people upon whom they visit said scumbaggery. There in lies the main flaw, they don't. In many cases, they relish the backlashes on the forums and do what they do for the attention.
Ostracizing and "Kill on Sight" lists have proved more effective from my personal experience. The step taken by the societies is one in the right direction. Their members will know who to work with and who to shun and offer no quarter to. In WT the squad I belong to keeps a kill list, people who purposefully team kill and carry out douchbaggery in general. No matter the team, they are taken out first. We may lose the battle but we will not allow them to continue ruining the game for others. The Devs should have an open channel of communication with the society association so that repercussions for these acts, ie. organized players exacting retribution, is not frowned upon when the receiving party has been shown to be a bad apple. It is best to make the game utterly unplayable for them until they change their ways or quit.
Now, the society heads need to stay cool and on amicable terms. We had something like this on the British side before lunch in PotBS Antigua server. It fell to pieces within a week of launch because the individuals at the top had differing opinions. The Spanish soundly beat the Brits and the British nation didn't recover for a long while after this. The animosity was too great for people to cooperate. So, that would be my cautionary tale.
Either way, it is up to us to make this a community that doesn't welcome unsportsmanship. Publicly denounce behavior as in the ramming thread and shame those who practice it/them as a group not as individuals. Privately pass word as to the individuals involved and put them on alert via PM. If they refuse to stop, kill on sight, by both sides of the match, then resume the fight.
At any rate, we are in agreement that we don't want people to act like douches in game.