Creationist subscribe to the concept that life was created by a God. An eternal being that is omnipotent and all knowing. Thus, a being capable of creating all life would logically be "intelligent". This is the derivation of the concept of "intelligent design".
Parasites are highly evolved and highly specialized organisms. Anyone who has ever taken parasitology knows how astonishing some parasites are. However, true parasitism as defined in the biological sciences offers nothing of value to the natural biological realm. That doesn't cause a biologist any grief because evolution follows a path in accordance with the natural realm. The Universe has no conscience. But why would a God create parasites? Creationist have a hard time with that question. Some Christians will say it is because God wanted to punish man as a result of the debacle in the Garden of Eden when Eve ate the forbidden fruit. But why punish the entire living community? Foxes, bovines, cats, monkeys, rodents, etc?
Creationist just don't have a good explanation for the origins of parasitism because it cannot be explained by intelligent design.
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