You can’t just say right-wing politics have done this when we all know how many have died under communism, socialism, and anarchism. Priests are killed, landowners are killed, genocides happen, and tens of millions starve. These are just a few examples. Nationalism can be a left-wing or right-wing attribute. It’s just that the far-right tends to be imperialist/isolationist while the far-left tends to be more globalist.