I think it's because of the PvE carebear mentality. People play PvP against other real live people, get beat, and think they were sposed to get participation trophies, think that they should be able to learn a script, think that it's not fair for "the boss" to be harder or have different mechanics each time. I liken PvP to a PvE boss fight - for a full 15 minutes, every time you enter a warzone, with random mechanics that you need to learn on the fly. Many can't handle the stress.
This makes people rage, and wail against a wall. "PvP is stupid, this is why. Blah blah OP Nerf Exploit Hacks". Nobody's willing to admit their own shortcomings...
Except for this guy apparently.