They will never learn because they do not accept that there is any reality.
Liberals are followers of philosopher Friedrich Wilhelm Nietzsche who taught that there is no objective reality, Nietzsche himself rejected the idea of objective reality arguing that knowledge is contingent and conditional, relative to various fluid perspectives or interests.
IF there is no objective reality then there is no truth and good and evil are conditional on perspective.
Liberals like Nietzsche because being freed from reality and moral absolutes means they can do whatever they want without repercussions.
And as an added bonus because the rest of us insist on living in the real world they can use our moral rectitude against us whenever we fail to live up to our own standards.
Pouring that kind of universal solvent on everything is perhaps a useful mental exercise, but living it gives us a hell on earth.
Sometimes men have to learn from the consequences of folly because they won’t learn any other way.
And the Garden folly was “knowing good and evil.”
That was double trouble because, first, no human mind could contain all that anyhow; and second, what a human mind could contain, it would often get wrong.