Scripture's simple explanation for the evil we find around us, can not be questioned in that it explains everything. It is common sense. It is scientifically reasonable. There is no other explanation of any worth.
Spiritual evil - physical evil
The tempting angel and Adam and Eve thus brought forth spiritual evil into God's creation by means of a physical event - eating the fruit of the forbidden tree.
Here we observe that God then decreed that, as a result, mankind would face physical evils - suffering, failures and death.
It seems to me that the spiritual evil is that which leads us to eternal-death unless we repent.
However, the physical evil of suffering and death, I suggest, is a remedy, a blessing, an appeal to God for mercy, balancing out the spiritual evil.
Thus, Christ's Passion and Death brought Mercy upon all physical creation.    W