This is the very first time a spawn camper has ever created joy for me. Thanks to the unnamed camper, thanks to Eliseth for bringing this up, triggering the post by Hadfael for which I'm so greatful. It made my day, in fact.

Still, on less happy news, I am mostly in favor of the OP's view, because, in a way
1) the community as a whole is, just as it is IRL, in charge and
required to police itself, to a certain degree. Social courage, encouraging the "correct" behaviour as defined by the community's ethics, and discouraging "wrong" behaviour, are part of this. Thus, every player is required to not only not violate the community's ethics (which is
against PL), but to also try to ensure that others don't as well. Once a community starts implicitely condoning offenders by ignoring them (the "it's not my problem, let the authorities deal with it!" line o f thinking), the gap between population (playerbase) and authority (GMs) will start to widen as both authorities and population lose track of what the authorities are there for, resulting in a "community" where the players are viewed by the GMs as cattle and the GMs are viewed by the players as the oppressive establishment that must be tricked and subverted in any way possible. That will result in the authrities not deciding and doing what's best for the playerbase, but only for themselves, and the playerbase doing the same, driving this cycle further and further until corruption and crime (power abuse and cheating) are all that's left.
2) They
are doing harm. Not directly, visible harm, but abstract, show-up-later harm. Degrading realism for everyone, inflating both economy as well as skills, taking up resources (bandwidth, MOBs) that therefore are unusable for players using PS the correct way, etc., pp.. Simply that they don't cause you to lose attributes or money or spam / hinder you does in no way mean that they don't cause harm.
3) This may be true, but while PS does give a certain degree of freedom to players, reducing it to that "fun" thing does arguably cross the line. As has been said, I think that the least of those who do that camping "fun" actually enjoy it, but even if, they should seriously consider a game more suited to them that does not have all the petty and useless features like a chat box, and in fact a movement system. Less bugs, more "fun"...
4) Indeed you will be, until everything you have constantly and blissfully ignored will have mounted so high that it suddenly rips open your eyes and forces you to see it. And that is when it's both too late and excessively painful, and it's the point where IRL the newspapers are full with headlines like "Why did noone see this coming? The signs were
so clear!". So stop concentrating on yourself before everything you ignored starts concentrating on you.
Edit: This towards the original discussion; the foretold change in the system will remove some of the problem AFAICS, and it shows that this sort of "fun" is not what PS is intended to be used for.
Edit 2: minor clarification