What if the survival of the planets biosphere depended on 8 out of 10 humans dying. Could you save the world by causing this culling of humans? What if you knew if this didn't happen not only would the remaining humans die but the rest of earths life along with them? Could you "release the Virus"?
Is this a 'tailored' WMD or just a random 80%?
You sound like a eugenics promoter.