Of course, killing everyone over and over and over again in BA is a dick move and hurts the online, but that is the only part where i agree.
Pvp and provoking is a part of the game, if you can't hold your nerves over a god damn video game, then you should deserve a ban.
In my country there is a saying, which roughly translates to "the smartest one concedes", and personally i agree and do exactly that. If there is someone killing and/or provoking at the same time, just leave, wheres the problem? Plenty of other places to level up, which are all half empty.
These particular topics you mentioned, the ppl who got killed, they probably are noobs who think BA is the only place to lvl up, so they get mega frustrated and then they start talking and then Sight just adds to gas to the fire pit until it finally explodes. You know how it could have been avoided? They could have left to find another spot somewhere else and not talk at all - boom problem solved.
So all of this... There would be no "heat of passion" if people would just use their brains more often, so all-in-all, I think this is all part of the game, you have to get used to it and change locations if a dick like this comes to BA.