People keep expecting Hydaelyn to follow the "benevolent diety/god was hiding something bad all along" trope when there still hasn't been any set-up for it.

We also don't know the mechanics of how a Calamity actually works. So there's much speculation about what is really happening in a Calamity and how it is really happening. And inevitably people wonder if that might be the thing Hydaleyn is hiding the makes her out to be not so great.