Evolution does not have to be kind.
All that matters to evolution is survival. Survival of bacteria, viruses, microbes, parasites, hyenas, whatever.
It is an important part of the job description of a loving God, and that is who is needed for "Intelligent Design" to take place.
An omniscient and omnipotent God would hardly allow such things as elephantiasis, Guinea worm and a huge variety of ghastly diseases. There is no reason for the universe to abound in cruelty, but it does.