I think the main problem of pvp content is "time", comparing with the pve and wvw contents pvp taking more time to get experience and resource, for instance 1 ranked pvp takes about 4-5 or more minutes for queue ( in some cases some players not accept and this going again ) and 12 minute for pvp, lets say 20 minute only one pvp game and if you lose you get about 500-600 experience and vice versa 1500-1600 experience. Thats mean you need waiting more for playing pvp, but other contents not like this. And time issue make toxic players, because this is annoying waiting hours for just little experience and resource, this is my opinion.