It's a natural effect of the adversarial legal system employed in the US and UK
It really has little to do with the common law. That's how lawyers work in civil systems too, that's how they worked in the old Roman empire, it's how they worked in the Republic and in Athens and generally speaking, it's how a lawyer works. A lawyer is a hireling with a job to do, not some charity for the public good.
To the more general point: I think what you're arguing against is ultimately the basic understanding of the random nitwit that he has no clue as to how the world works, and as such once people with an actual clue get involved it's about time to stfu. Sort of like saying "an adult advised me!" among preschoolers. Sure an adult is not here nor there as to whether the advice is sound, in principle. In practice, at least he's not 5.
but I'll also re-iterate that I do not believe Theymos should be involved in the scammer tag proceedings. I believe there's a fairly clear conflict of interest.
FTR, what is the conflict?
And at the rate things are going scammer tags will prolly just get phased out, the mods lack both the training to handle the ever-increasingly complex arguments brought and the drive to even bother, on top of which the constant haranguing which necessarily comes with the territory is wearing everyone thin.
Sooner or later we'll have to have some sort of court set-up, and the logistics of that are staggering.
They are required to tell the truth as they know it at all times in a legal proceeding.
This is patently untrue. You can verify it very easily: go kill someone, call up your lawyer, tell them you've killed the someone and see if he stands up in court and says "Your Honor...he has told me he killed X".
ie. client tells lawyer he killed someone lawyer cannot put client on stand to testify if he knows the client will deny the fact he has been told.
Who the hell told you this? If things actually worked that way we'd have a simple test now wouldn't we. In other news:
A state bar association has suspended the license of a lawyer for making truthful statements in court filings.
http://legalschnauzer.blogspot.com/2011/08/telling-truth-costs-lawyer-her-license.html(Yes, obviously it's different in civil proceedings. A lawyer who knowingly allows a civil defendant or any witness to give false testimony can be disciplined and even lose the right to practice law. A lawyer who doesn't allow a criminal defendant who insists on lying under oath to claim his or her innocence will be disciplined. Your using of the wrong example would seem to indicate you don't know what you're talking about.)