Certainly Superman is an alien, but he’s still a humanoid, not an animal. And he’s more patriotic than a lot of present-day Americans.
Lucky he didn't work for the Nazis.
Uberman: I am.. Uberman! I have superhuman powers, and I fight for untruth, injustice, and the Nazi way! And I have X-ray vision!
Lois Laneoff: X-ray vision? Can you see through my clothes?
Uberman: Ja! And through his, too. [ points at Jimmy Olstein ] He’s a Jew!
Jimmy Olstein: No! No, it’s not true! My parents were just very advanced in hygeine, that’s all..!
Hitler: Silence! Guard, take this Jew away!
Uberman: No need! I’ll drop him off at the camp on my vay to the Eastern front!
“he’s still a humanoid, not an animal”
Well, sure, but he’s not human. Apes look vaguely humanoid as well, but if you have sex with one, you’re still a pervert.