Birth is a grace, and it is obtained through devotion to Our Lord. Those who die before they are born, or even when still toddlers, are not evil, but rather, God knows that they will be of greater help to mankind by their intercession in the life after death than they would be on Earth.
But this is not an excuse for abortion. It is, rather, a consolation to those who weep over the evil of abortion. God draws out of evil a greater good.