Science was noticing that certain modes of thinking uncovered beliefs that let us manipulate the world—truth as an instrument
So, the motive should be to gain the ability to manipulate the world?
I tend to be suspicious of morality as a motivation for rationality, not because I reject the moral ideal, but because it invites certain kinds of trouble. It is too easy to acquire, as learned moral duties, modes of thinking that are dreadful missteps in the dance.
Yes. Morality changes every few years. What we were taught as children does not hold that much value in this day and age. Instead of morality being the base of rationality, We should keep Rationality as the base of morality. But I doubt that too.