One of the problems with PvP is game design itself: Levels, Hitpoints, Gear.
The lowbie doesn't stand a chance against even a mediocre PKer.
As I've posted before, in the real combat, anybody can kill anybody. The kitted-out commando can be killed by a kid with brick. Combat Helicopters can be brought down with Kmart RPGs. Seventy-ton Tanks can be flipped by crap surplus cobbled together in a shed. Skyscrapers can be toppled by guys with a box-cutters.
Depending on perspective, these can be generalized as "Lucky Shots." The success of such attacks is related to winning the lottery. There are ways to increase the odds, but it's still a gamble. Some die because their bootlaces hung-up on a tie-down buckle. Some survive because a primer miss-fired.
Our Digital and PnP Systems can't cope with the randomn quirkieness of reality. Even "Skill-based" games still have lowbies unable to effectively fight back or even defend themselves.
And why the heck is the guy decked out like a minor knight even bothering with a peasent in the first place?
Mechanics aside, digital worlds cannot emulate the true nature of violence. Violence, particularly lethal violence, contains severe mental, emotional and abstract dynamics, of which we have no concept. This is not the place to discuss such things, but maybe it should be.
/tangental rant on
Like digital games, our civilized worlds have abstracted and trivialized reality. We have allowed ourselves to ignore the foundation levels of Maslow's Pyramid (http://psychology.about.com/od/theoriesofpersonality/a/hierarchyneeds.htm). Our forebearers have truly made the world a "better" place. We don't know what it means to survive or what that includes. We've seperated ourselves from that which gives our lives meaning or real purpose. Why else would we waste our time in fantasy worlds where killing is fun? The fact that we have the "free" time to do such boggles the mind.
The concept of "Free Time" is ludicrous in itself. Our time existing in this corporeal form is limited, yet we label our time as work and play, priority and chillin', on or off, busy or free. But we all know that nothing is free; everything has its price, and we all will pay, one way or another.
Think beyond work and bills, and consider real living. Consider real things of value, like joy, love, friendship, eye-smiles and uncontrolled laughter. We've blind-folded ourselves with comfort and safety. We wonder why narcotics is a trillion-dollar industry.
I'll end my rant with a simple truth I've discovered in my wanderings: The World Of Man is filled with Greed, Corruption and Pain. Faith is our only Solace. Love is our only Hope, and Unending Labor is our only Reward.
/tangental rant off
Like our socio-legal-economic systems, PvP systems are mechanically flawed. They will always contain the exploiters and the exploited, it's the natural way of things. And until these games remove the immunities given by levels and skills, PvP will be continue to be silly and aggravating.