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Another great anime to watch for its philosophical undertones is "Hellsing".
A key part of the plot is how there ends up being no real distinction between how the undead/vampire + one cyborg Neeeezis and the Catholic Church operate.
Both are obsessed with war and purity. Both openly slaughter millions of people (men, women and children) in the climax.
Both send their champions to fight Alucard (who is against both the supremacy of the Neeezis and also the supremacy of the Catholics). Both are defeated by their own hubris (in addition to Alucard's wit).
You can't beat death itself.
https://www.youtube.com/watch?v=aNl1buMHKIY&ab_channel=WHATISUTUBE
And, if you like more humor, you can always watch Hellsing Ultimate Abridged.
The philosophy doesn't change haha
https://www.youtube.com/watch?v=LuCAv2qz7Ek&ab_channel=%D0%94%D0%BE%D0%BA%D1%82%D0%BE%D1%80%D0%9C%D1%8D%D0%BD