No one thinks they are infallible.
Really? Because that absolutely seems to be what people are laying claim to. DM is absolute authority, don't you dare question them.
The role though does not function well without that power.
As noted above, I disagree heartily. Consensus and collaboration works quite well, when you treat your players as fellow human beings trying their best to produce a good time for everyone involved. And if any of the players is participating in bad faith, the exercise is already doomed from the start. No amount of DM authority can make a bad-faith participant behave themselves.
Players if given exactly what they claim to want will destroy the game.
Yet this argument never applies to DMs? Something fishy about that.
There is nothing to be had by a DM tormenting his players. It doesn't lead to a bad game. I would expect such a DM to lose players.
The DMs who do it get jollies from it. And I've seen real, specific people on this forum talk about exactly that. One example was a DM who said that they'd allow players to play dragonborn at their tables...but every shopkeeper they ever met would act like any dragonborn PCs
weren't even people and would completely ignore anything dragonborn PCs said. That, eventually, the players would either wise up or depart the table.
This was directly said, to me, in an actual thread on this forum. I don't like naming names, so I won't name who did it. If you really care to read the original post, I can dig up a link for you, but I'd send it to you privately.
There are DMs practically popping out of the woodwork to ban this, ban that. To crap on player preferences. To nail down everything they possibly can about the setting and allow absolutely no deviation or variation--to the point that it literally isn't even possible for someone to say, "Well, couldn't I come from a faraway land unknown to these people?" because the DM already knows every possible land and every possible people on those lands and every possible political faction in all of those places. (And, yes, I am again thinking of an actual, specific person on this forum when I say these things.)