PvP servers lost population because no PvP content has been released for years.
If the same happened to PvE content Crom would have become empty way earlier than Fury.
Try to imagine last few years of the game without T4 raid, T3.5 raid, House of Crom, Dragon Spine, Unchained 6men instances; while PvE side of the game got all these updates (which anyway are not even enough, since T5 should be here already), PvP got nothing until now.
This is the main reason why Fury lost players, coupled with terrible Funcom design choices (PvE T4 gear beeing way better for PvP than PvP gear on some classes, PvP AA progression way slower than PvE, bad class and gear balance and more).
It has nothing to do with "bad" PvP attitude or lack of social skills by PvP players (who btw are human beeings like you, they don't belong to a different race because of some genetic modification caused by playing PvP
).
What is true is that PvP gameplay makes a person more used to sudden reaction and sometimes rage: in PvP generally you must pay more attention, because you face unpredictable situations, since you play vs other players who, if skilled, are way more challenging than any scripted content can be.
Also you can't rage versus an NPC boss, while it's very easy to rage versus other players (even more versus your team which in minigames, unless you are in Tournament Mode, is made by random and often unknown leople)
But trust me, "bad" attitude, epeen and elitism exist in PvE exactly as they exist in PvP, and even more.
PvE players who feel "elite" talk on TeamSpeak about how other poor players are bad, act with hypocrisy toward other players considered less skilled / geared, build huge epeen on the "experience" got by repeating the same scripted content 1 thousand time, refuse every kind of feedback etc.
After having played a lot both sides of the game, I can say I definitely prefer a lot PvP side of the game from social point of view (if Funcom could just add some proper group PvP features... ok please allow group minigames signups).
I have got a lot of rage and raged a lot because of PvP, but rivalry vs other players / guilds is part of PvP experience and fun; behind that there is always genuine respect for good and / or fair players, both buddies or opponents.
It's something that in PvE doesn't exist on the same level. I know a lot of playears who hate each other and keep playing in same guild just because they "need" that for loot, raid spots, DKP and stuff like that.
Personally when I felt like that (I mean not feeling any motivation from others to play together if not loot, DKP etc) I have chosen to change, but I know a lot of players who keep staying ignoring problems and accepting cold attitude just for such reasons. It's perfectly understandable of course, most guild probably are like that (but not all to be honest), but then big LOL to PvE players talking about lack of "social skills" or respect in PvP
I'm not saying that all PvE players are like that, there are many different behaviours in PvE too which from social point deserve max respect (like helping newbies with tactic explanation, leveling, getting gear bringing full geared chars, developing stuff for the community like awesome featplanners and utilities by Johara and Nedbee or Cynara blog).
I just wanted to show you things from a different point of view.