What makes you think they’re not?
Bill Gates said he’d like to be reincarnated as a virus, so he could reduce earth’s population to 500 million.
While Gates has said: “The world today has 6.8 billion people. That’s heading up to about nine billion. Now if we do a really great job on new vaccines, health care, reproductive health services, we could lower that by perhaps 10 or 15 percent.” Which expresses his desire to lower birth rates rather than his expressing a desire for mass deaths.
It was Prince Phillip, the Duke of Edinburgh who said: “If I were reincarnated I would wish to be returned to earth as a killer virus to lower human population levels.”
Even if it was said as a joke, that is some serious evil.