If they are bad, extermination seems the wiser path and if clever people wrote virii, then they would in turn create good ones. Flagging down bad code segments in your operating system that could crash with a notify they exist or creation of jump code on demand to circumvent the bad stuff, i.e. code morphing in the current tech. Testing mass storage media and adding data to move up or compress to reductiion for block size optimization. This kind of controlled virus would be utilized most likely inside of an Oracle or some other DBMS closed environment to enhance performance. Retrovirii code would do much more sophisticated things to segments of instructions for performance, something I worked on theoretically since the 1980's.
Many parts of life have a stem rooted in virii.
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