According to the Catholic Church, if God is just and loving why is Nature so needlessly brutal and cruel sometimes?

This question was brought about after reading a quote from Charles Darwin saying he couldn't believe in a benevolent creator due to the existence of parasitic wasps (which paralyze insects so that their young can eat them alive). I have to ask why would God created things like this and allow the world he created to be so awful and full of suffering. I understand that Adam and Eve sinning would lead to them being punished but why would God also make the existence of other innocent creations so awful and create living things whose very existence means suffering for others. I am looking for an answer rooted in Catholic doctrine specifically.