If he left because people were scared of him, shouldn't he have justified why he's safe, instead of saying he can't be killed, thus strengthening their point?
easy way work hard for some time kill both human and demon or one of them and learn slave magic kill them all, enslave some of them to keep the world running and get the necessities. PS I think he like the maou lol but did not realize yet
That's also more or less the reason Lex Luthor hates Superman in most versions of his backstory.
So yeah, I agree with ya... they are just afraid he would become the next overlord which is a legitimate concern.
But they take it to the extreme and automatically assumes the worst.