I have no doubts that vaccines (even just the flu shot) can trigger awful conditions. Guillian barre is one that can be associated with flu shot I believe as well.

However, that said, I think there are either genetic predisposition or underlining process and that the vaccines set off. I don't know for sure, so just my opinion...BUT I do know that autoimmune diseases fall into this category and are typically set into motion (not created) by infections, illness, trauma, etc...ANYTHING that affects the immune system. So it stands to reason that vaccines (which directly and purposely alter the immune system) would do the same and set into motion a condition that was likely dormant, but already present.

Again, just my opinion.