Sometimes you're dealing with a domain where explicit reasoning provides the best evidence, sometimes with a domain where emotions provide the best evidence.

And how should you (rationally) decide which kind of domain you are in?

Answer: using reason, not emotions.

Example: if you notice that your emotions have been a good guide in understanding what other people are thinking in the past, you should trust them in the future. The decision to do this, however, is an application of inductive reasoning.