This sounds like the Preist of Discord system that EQ had. Most chose the non PvP option.
If PS had a system like this, then we could at least find out how many players actually liked PvP. Presumably the ones that wanted it would select the option.
At the very least it would be like casting a vote. Make it a one time option to be chosen at the begining.
How should the PvP system work
-- no rules, atack anyone anywhere?
-- attack anyone, anywhere but a safe newbie area?
-- attack anyone outside any city zone?
-- attack anyone in a wilderness area far from the citys?
-- attack only characters near your skill level?