There is a commonly human “head vs heart” struggle. People are naturally tempted to regard what is good and evil as fact. The fact of what is good and evil (head) replaces the opinion on it (heart).
Properly goodness and evil apply to the agency of a decision. The soul which does the choosing is good or evil, and the existence of the soul is a matter of faith and revelation, which is a form of opinion. That the existence of the soul is a matter of opinion, makes good and evil a matter of opinion as well.
Evolution theory acts as a catalyst in the head vs heart struggle, multiplying the pressure on subjectivity, by rejecting any knowledge about how anything is chosen in the universe (creationism / intelligent design), including rejecting knowledge about how people choose (free will). With evolutionary ideas replacing knowledge in terms of how things are chosen, subjectivity is discarded with it, because subjectivity applies solely to the agency of a decision.
This then leads to societal catastrophies, such as nazism and communism in the past, but also in the present day something like the depression epidemic, the culture war, the decline of religion, may be attributed to it.
Schools and universities should teach the different ways of how things are chosen in the universe. Teach the best available theory on it as they see fit. This will maybe advance science about it a little bit, but more importantly it will provide people with a critical confidence in the practical knowledge they already have about making choices in daily life, and most importantly it will safeguard subjectivity, and thereby avert societal catastrophies.
If people accept subjectivity is valid, and then proceed to be subjective in acknowledging what emotions people have in their heart, the emotions with which the behaviour is chosen, then that is a basis for civilized relations.