I think we are. Not in a direct way, really - I don’t think there is an institution anywhere in the world, any time in our history who would be able to cover the gamut of possible decisions in even ONE human life.
But education isn’t just classes and degrees. LIFE is education. All of us are brought up in one way or another, having to confront the expectations of our parents and other elders. We go to school, interact with our peers and learn something of the delicate weave of social interaction (some of us are more adept at that than others).
Eventually we grow old enough to stand on our own two feet. We make mistakes, often as much as we make good judgements. We learn what we want for ourselves, and hopefully we are able to achieve it while making room for those we live with to reach the goals they have set for themselves.
As trite as it sounds, I think life is the ultimate teacher. We learn more through our experiences than any textbook or sermon would ever be able to provide. Hopefully we are able to learn from those mistakes we make, and thereby make less of them.
That said, I don’t think that the best way to learn not to murder people is to find out the hard way. That’s what laws are for - to outline the consequences of behaviour that is detrimental to society on a broad level.