It seems to me that the developers of BDO didn't really know what to do with pvp. How it is now is pretty shit. There is open world pvp, but there is absolutely no benefit to killing other players. The only reason behind killing someone is either being a dick through senseless pk-ing or wanting a grind spot for yourself, which is equivalent to being a dick. Meanwhile the game wants to punish pk-ing with the karma system. Which seems highly counterintuitive.