In looking at the results of this poll, we can all see that there is many different ideas in the crisis. I don't believe any group is mentally ill. Saying so is a rash judgement and in the art of thinking well it is said:
The Christian law which prohibits rash judgments is not only a law of charity, but of prudence and sound logic. Nothing more dangerous than to judge of an action, and above all of an intention, from mere appearances. The ordinary course of things is so loaded with complicated events, men find themselves in such varied circuмstances, they act from so different motives, they see objects with eyes so distinct, that we often regard as a whim or caprice, what we find, when examined closely and in presence of the circuмstances, the most simple and natural thing in the world.
Maybe you caught the dogmatic sedevacantist on a bad day? Maybe you were so focused on your own theories you weren't really paying attention to their thoughts on the matter?
All this could be said vice versa.
The main thing is that in the mean time you follow your authority and do your duty and offer sacrifices and conquer yourself. If you don't have an authority, find one, like a spiritual director. Pick carefully because you really shouldn't change them often. (This is especially important for women picking husbands, because you will be bound to that authority for life.)