[houkoholic]

Ezelcant doesn't actually say it out right but he does imply that the Vagans are the superior race compared to the Earthnoids when he says that the Earthnoids don't deserve to live on Earth whereas the Vagans do, especially considering that they started to name themselves "Vagan" as an attempt to differentiate themselves from people born and lives on Earth. Also the fact that the Vagans call people living on Earth "Earthnoids" is another hint which they consider themselves to be a different race altogether because the term is clearly projecting a vibe of alien-ness in it.

Put the two together the implication is pretty clear - the propaganda is clearly that Vagans are superior to the Earthnoids and thus have the right to kill and take over their land to claim it as their own and shape it in a way that is superior that how the Earthnoids are currently treating it, there's just loads and loads of self-arrogance there. And when arrogance is involved then clearly a thinking of superiority is there too.