Kant really couldn't; his principles of maxims and unversizability are awkward at best and unworkable at worst.

But that does not mean that the core assumpiton that individual human reason can provide a sense of ethics and right action is wrong.

Like anything else people come in an infinite gradient of degrees of self-realization and free ability. My observation has been that the freer they are in their exercise of ability, reason and emotion, the more natively and naturally they tend to seek optimum ethical solutions.

A