I disagree. I don’t think one can point to an obvious moral reason behind all the ways we and all other animals suffer pain, ignorance, dangerous distractions, overblown fears, mental and physical, disabilities. The idea that God teaches us great lessons via all such things makes a mockery of our desire to dispense with measles, mumps, scarlet fever, malaria, smallpox,TB, Alzheimer’s, and other great plagues.
Also, natural disasters and dangerous parasites & diseases afflict species other than humans. These animals often die with no humans learning anything about their life struggles, suffering or deaths. Animals also face competition for food and mates and have to balance aggression and mutual aid. Is this all just to teach humans lessons? Looks more like we are indeed part of nature.
And concerning innate morality compared with learned morality, consider that self sacrificial mother love is built into many species.
Also, the desire to sacrifice for one’s tribe or culture arises naturally in humans raised within that particular tribe or culture, such that one would often rather die than be separated permanently from one’s tribe or culture, or see one’s tribe or culture annihilated.
I am reminded even of a case of young humans adopted by wolves. When the humans were taken back to the village the wolves marched up to the outskirts of the village to howl for their return.