Many people believe that about climate change (due to global political disruption, economic collapse etcetera, praising the size of the disaster seems virtuous).

Hm! I cannot recall a single instance of this. (Hm, well; I can recall one instance of a TV interview with a politician from a non-first-world island nation taking projections seriously which would put his nation under water, so it would not be much of a stretch to think that he's taking seriously the possibility that people close to him may die from this.) If you have, probably this is because I haven't read that much about what people say about climate change. Could you give me an indication of the extent of your evidence, to help me decide how much to update?

Many others do not believe it about AI.

Ok, agreed, and this still seems likely even if you imagine sensible AI risk analyses being similarly well-known as climate change analyses are today. I can see how it could lead to an outcome similar to today's situation with climate change if that happened... Still, if the analysis says "you will die of this", and the brain of the person considering the analysis is willing to assign it some credence, that seems to align personal selfishness with global interests more than (climate change as it has looked to me so far).