Citation? I don't see anything in the announcement that indicates this is being driven by "US morality". Given the US has one of the largest porn industries on the planet, I think it's a bit of a leap to make that claim without some proof.
>What about Discord blocking servers full of war scenes and car chasing with shootings?
What about it? They're a private company who may choose to not be associated with that content. If you tried to post raw war footage on HN it would be immediately removed and you'd likely face a ban if you kept doing it repeatedly. Is that "US morality" or just a choice about what content they want to host/link to?