How are spoilers such a big deal to you that you throw literal tantrums over it?

It changes absolutely nothing. Even if you know what the ends is, you don't know how things even evolve to get there in the first place, so what does it even matter? There's been polls done before and more people said that their experience wasn't destroyed at all by being spoiled than there were people who said their experience was destroyed by spoilers. In fact, more said that it actually enhanced their experience knowing what was going to happen at some point, but not exactly how. So the element of surprised and wonder was still there, but instead of just being in the 'unknown' zone, it was more in the 'how' zone while actively trying to piece things together as the movie went along to see how it dies in with the spoiler.

It ended up giving people more of an active watch when they were spoiled than just passive one if they weren't.