Dude killed millions but saved billions

Context: Fritz Haber was a German chemist who won the Nobel Prize for inventing artificial fertilizer. A revolutionary invention that is responsible for around half of all food produced in the world even today.

However, he was also a staunch German nationalist and pioneered the weaponization of chlorine and other gases for use in warfare, earning the title "father of chemical warfare".

Because of his contributions to chemical warfare in world war 1, nobody talked to him after the awards ceremony.