Honestly anyone at 120 who camps low level quest hubs is alreadly losing, because the players questing there are at least progressing a character, while that 120 might just as well afk for all the good it does them. 120s who gank low levels are essentially slacking. They could be doing something useful like raiding or arenas or M+, but instead are wasting their time griefing other players because their egos are desperate for some sense of power.