Maybe you don't understand what conjecture is. The main points I've made:
  • Tank stood for long periods of time doing nothing
  • Tank acted like he didn't know what was going on (this one kind of is)
  • The trash mobs are incredibly weak, so I pulled them rather than wait on him
  • Any job can tank just as well as a "tank" in the beginner dungeons
  • He was a gladiator, which has no moves other than sprint to use up all TP in a low level dungeon, which I never saw him use
  • I could see him at full MP, he wasn't waiting on that
  • He never said anything in chat, I did
  • I don't blame him or call him a bad tank
  • I don't consider what I did wrong

The main points other people have made:
  • This is why there are bad tanks at end game
  • He could have become a good tank had I instructed him
  • Only tanks are allowed to tank
  • He was wrong
  • There is only one acceptable way to play or else you're wrong
  • If you don't instruct new people or anyone not playing that way of the right way to play, then you're wrong
  • This game is like a cult

I hear exactly what you're saying, and I disagree and state my reason, or ask for your reason. The response is basically "because that's the way it is," or "because what you're doing is making bad tanks (this is conjecture, btw)." Things worked just fine my way, and for all I know the tank was happy that things turned out this way, since he never said anything (some more conjecture for you).