What is the single biggest dick move in all of history?

Hitler killing hitler and thus not giving everyone else the satisfaction of doing so

Opium wars were pretty dickish. You don’t wanna buy hard drugs from us and turn your population into useless addicts? Fine, we’ll invade you and bombard your cities until you start buying!

Trojan Horse

Probably when they relocated Rasputin’s shlong from his body to that jar.

Winston Churchill deliberately diverted food to countries like England and Greece while Bengalis (Indians) starved to death. He knew of the genocide he was committing and was when reminded, mocked and blamed the people for ‘breeding like rabbits’.