It is built in their genes. Wherever they go, they must also rape.

it's called the right of war, remember that your great-grandfather is probably the Russian who raped your great-grandmother entering Germany.

Historically war throughout the world was always about rapes - people believed that by adding their genes they conquer the nation. It was like that since ancient time (it was more like 'kill all men and rape all women' back then) and up to latest years, like there's evidence some Serbian generals actually ordered their solders to impregnate Bosnian muslim women.

By the time the eastern monsters invaded the land of purity my grandmother had already been born to my great grandmother, so your thesis is false.

A for effort though.