just me and my brain. enjoy!

You’re growing up too fast for me kiddo

Need them back

Humans are born into sin, inherently sinful and must spend their lives repenting for their nature (simply by being 'witches' he probably believes there is no such redemption for the inhabitants of the Isles anyways).

Your soul will be doomed to the ashes of hell if you don't repent now. Belos probably saw the 'devil' in his brother and thought he was doing a service of god to kill him.

Remember we are dealing with The Demon Realm. Belos probably believes he is trapped inside some kind of hell. The Titan is the BI's version of God, and he just repeats the rhetoric he's internalized to make it digestible for the citizens here.

He literally thinks he is a saviour and all of the carnage is worth it because he is ridding the world from the influence of the demon realm; which I am sure is very intentionally a society free of homophobia and racism, things that have been largely installed by Christianity and religion.