I completely disagree, Anyone has the ability to multi log and attack or defend themselves. Limiting people based on the fact they are more skilled at doing it takes away a massive skill factor to pking and the game in general. I have pvm'd on my ironman in wild and had my main logged somewhere nearby to cover myself. It's easy enough to attack the barrage guy on your main and tank the tber on ironman. It can be done with relative ease unless they are highly skilled. All you need to do is always be prepared for the worst and never risk what you aren't willing to lose.
You are making it sound like only the pker gets the advantage, THIS IS THE WILDERNESS, if you don't want the advantages it can offer then do not risk it. However if you want to reap the rewards it can offer then suffer the cost at the chance of being pked.
I would like to add i am mainly a pvm'r and this could hurt me in the future if passed but that is just part of the game, i would never want to take away a huge fun factor for people based on the fact i don't like dieing in a PVP zone.
You made the point it is unfair to allow multi logging as its unfair to the "1 player in single combat", Should we disallow clans and teaming in singles also? Based on the logic you used we should. Multi logging and pking on two accounts is twice as hard as it is to have a buddy do it for you. NEVER forget pvm'rs can multi log 2, and if the reasoning you don't do it is because you "can't" then that is just tough luck in my opinion.