Plenty of military decisions don't make any sense. They obviously didn't intend for the virus to get out into the public, and they were still modifying it so maybe they thought they would eventually be able to control it. Biological warfare doesn't make a lot of sense. But if you're doubting the lethality of COVID-19, just look at year-over-year statistics on everything from deaths to strokes to organ failure, anything that a weakened immune system can't fight off. The numbers are markedly higher since 2020.