I wouldn't call this a PvP game because people do not seek out PvP and will do everything in their power to avoid having it on anything resembling fair terms. All the grinding, all the bots, all the extreme effort in gaining stats is meant to give you an advantage so that you can make PvP as brief as possible if you're the aggressor, or as safe as possible if you're the one fleeing across 5000 map tiles with all scenery converted into neon squares for the best gaming visuals since Pong. Seriously, look at The Moot and tell me this is a PvP game. I'd say it's more of a Sandcastle Kicker simulator.
I'm still new to this game, but I've played quite a few online games in my time. From what I've seen in the forums-- and in the game myself from talking to other friendly people-- the gankers are more like a force of nature that you simply deal with if you're unlucky enough to experience it. It's like in the Harvest Moon games when you a get a bunch of crappy weather days that block your progress. You really wanted to plant some new crops today, but the game decided that you don't get to. If GokuThaThugKilla420 and his posse decides to ruin your day there's simply no recourse and you just accept it, or play a different game if it frustrates you enough. The one thing that all stories share is the sheer futility felt in anyone trying to change things. No one is going to form a vigilante group, it would just be suicide because you're fighting a level 5000 Battleship as a level 2 Rattata.
Haven reminds me of Ultima Online in that it had different playstyles forcibly sharing the same world. In that game, though, people organized tournaments and sparring among friends was common. People liked training and fighting. They even formed anti-PK patrol groups, even if they were never successful. I don't see any 'Valhalla Tournament this Saturday" threads, so I'm going to make the basic assumption that no one enjoys the combat itself, on fair terms, without the idea of inflicting penalties on rivals or weak bystanders.
Ultimately, UO's developers considered its player justice system a failure, as the good guys could never win. That was a game that eventually penalized PKs in ways Haven never would, like 20% stat loss on what would be a KO in Haven. Even with that penalty, though, murderers very rarely died because they had every advantage.
So it is that the "PvP" in this game is just a hurricane that damages your crops. However, a hurricane, as a large mass of magnetism-powered water, has a better personality than the typical Haven ganker.