Most people change their occupation many times in a lifetime. The purpose of education is therefore to prepare people for change rather than to train them for a single profession. An uneducated person is one who is unaware of what he or she does not know. Expediency is the enemy of progress. No decisions are ever made with full certainty of all the implications.
Stupidity is unfortunate but excusable.
Ignorance has no excuse in a democratic society. The only decisions that are sure to be wrong are those that will hurt others. A decision made sets a path that cannot be retraced. One can never know what might have happened if another path had been taken.