Ya.. sad state of affairs when a Stigma has gone that far. I have seen what you experienced but I was lucky to go through with intelligent people when I did most my things (like relic quest) on Warrior. I did however give people the option of the PLD tank who was usually less geared (I had some Allagan), but they always chose me. If the PLD's health was about 5500, I'd just let them tank things anyways as they'd mitigate more anyways.

I kind of scratched my head at a Hydra I helped an FC member with recently.. I was told they needed a tank so I came (I solo tank it normally) and there was a Warrior in it with 7500 hp. They still had me tank it for some reason (when I have other relic DDs) and was like w/e Lol. Felt bad for the Warrior, I know I've solo tanked it with closer to 7k HP on my Warrior without issue.