The point of emotions -- which I see I failed to make sufficiently explicit in this post, from the frequent questions about it -- is that their original purpose was to prepare the body to take some physical, real-world action... and thus they were built in to our memory/prediction systems long before we reused those systems to "think" or "reason" with.

Brains weren't originally built for thinking -- they were built for emoting: motivating co-ordinated physical action.

think that emotions often do the opposite. They narrow down the field of "all possible hypotheses" to "likely to make me feel good about myself if I believe it" hypotheses and "likely to support my preexisting biases about the world" hypotheses, which is precisely the problem that this site is tackling... if emotions subconsciously selected "likely to be true" hypotheses, we would not be in the somewhat problematic situation we are in.

Those are subsets of what you believe to be likely true.