

Largely because it’s a bit valid to be concerned that the indestructible alien could decide he’s bored serving the world and just take it over.
Xenophobic Lex is just a compelling villain, a bit like doom. Someone who has a sound reason for their actions, but usually takes really questionable routes.
Yeah, I think it’s actually envy with a side of pragmatism (he envies that everyone likes superman and wants that power, but also legitimately fears what a bad superman could do). But Xenophobic is just a funny way to phrase it.