As a child in the 50's and 60's, I read hundreds of comic books that were utterly awash in the most virulent Anti-German and Anti-Japanese propaganda imaginable. It was true hate propaganda, designed to depict entire nationalities as subhuman.

They didn't bother doing that to the Italians, because they didn't take them seriously enough.

Ever since then I have been well aware that hate propaganda is something commonly indulged in by the very people in my society who supposedly rail against it...as long as it is confined to the specific groups whom they have pre-selected as being worth of hatred by the ruling order.

In mainstream media North America since WWII those groups have mainly been:

WWII Germans
WWII Japanese
Communists

and more recently...

Muslim Militants of one sort or another.

The ruling media always want a demon for the public to focus on, so that wars can be fought and violence can be justified. As realpolitik shifts its worldly objectives, however, the face of the demon changes.

The present face of the demon is mostly a Muslim face. The objective is primarily to control world oil resources.