Good question. Here's the best answer I can come up with. There is no way RNA/DNA could just sort of happen. As Walter Remine notes, RNA/DNA is the basis of all life on Earth and logically has to be the work of a single pair of hands.
Nonetheless, logically, there is no way to picture an omnipotent and well-meaning God creating biting flies, mosquitos, ticks, fleas, chiggers, disease vectors, and the myriad cratures of Pandora's Box. Our present living world is clearly the work of more than one set of hands, and some of those hands were evilly motivated. We should shortly acquire the power to eliminate the creatures of Pandora's box on this planet, and we should not waste five seconds in doing so when we do.
A single pair of hands created RNA/DNA but, after that happened, others got into it. The evidence we have is that the engineering and re-engineering of complex life forms used to be some sort of a cottage industry on our planet, that more than a single pair of hands was involved, and that somewhere in the recent past all such activity stopped for some reason we have not yet understood, and that nothing which could create new kinds of animals is going on any more.
There is if you give it some thought. Without maggots the woods, plains, and roadsides would be overflowing in dead animal corpses. Mosquitos and ticks are food for frogs, bats and birds.
Just because you can't think ahead doesn't mean God did not.
How would these "DNA/RNA manipulators of old" even know about DNA? Why haven't we found their electron microscopes or whatever? Do you think they did it with magic?
Help meeee! Help meeeeeeeee!