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Something that virulent would mutate.  Can’t ignore the risk of it spreading to other animals like cats, pigs and birds.  You can’t vaccinate against the mutated version until it comes back to you in the wild, and they wouldn’t have the resources left to identify it to refresh the vaccine.

A bunch of robots that you don’t have much control over due to lacking the resources and skills doesn’t seem as fun as having humans to rule over.

It would be killing access to a lot of resources they like.