To be “not-insane”, you don’t need rationality in this narrow sense, in most circumstances. You don’t need to seek out better methods for getting things right, you just need some good-enough methods. A bit of epistemic luck could easily get you there, no need for rationality.
So the issue of behaving/thinking in an “insane” way is not centrally about lack of rationality, rationality or irrationality are not particularly relevant to the issue. Rationality would help, but there are many more things that would also help, some of them much more practical for any given object level issue. And once it’s resolved, it’s not at all necessary that the attitude of aspiring to rationality was attained, that any further seeking out of better methods/processes will be taking place.
To be “not-insane”, you don’t need rationality in this narrow sense, in most circumstances. You don’t need to seek out better methods for getting things right, you just need some good-enough methods. A bit of epistemic luck could easily get you there, no need for rationality.
So the issue of behaving/thinking in an “insane” way is not centrally about lack of rationality, rationality or irrationality are not particularly relevant to the issue. Rationality would help, but there are many more things that would also help, some of them much more practical for any given object level issue. And once it’s resolved, it’s not at all necessary that the attitude of aspiring to rationality was attained, that any further seeking out of better methods/processes will be taking place.