I'll let you in on a secret, I create a bio weapon that I'm going to use on humans.
Why would you do something like that? You feel like there is a threat?
The threat is already here. It's time to recover from the effects of this, so by informing the people it will be easy recover from the devastating fate.
Creating a bio weapon is extremely dangerous and can cause devastation to a lot of people. If you're looking for a means to remove the threat you should find other options that would be less catastrophic. If he continues bio weapons that you'll do more harm than good.
Do you think we should leave this thing roaming around for someone to use it for a bad reason?
I think you may be having some delusions. I don't really think there is anything that's going to justify using bio weapons. I recommend you seek some professional help to get these ideas out of your head.