You have to understand things on their own terms. A lot of times you can find a biological process that resembles something in computer science, but you shouldn't take the analogy too far. Nature doesn't know what a computer is, so any resemblance between a natural process and a computer is incidental.

You can't conceive nature as an engineer and talk about how sloppy and random its designs are. You have to bear in mind that nature has made things that we can scarcely comprehend, let alone engineer, so if you're critiquing its designs as if you can read its mind and see what it was trying to do, you're probably missing the point. It pulls off incredible things, so nature is the master and we're the student.