It's not just about threatening the US, it's about bolstering the Chinese moral across the nation, building a belief that China is a resilient underdog and the world is against it but it will fight back.
>China is a resilient underdog and the world is against it but it will fight back
U.S. propaganda is the mostly the opposite of this. We’re supposed to be an invincible freedom juggernaut who the whole world loves, including the poor, oppressed people of Iran/North Korea who generally love America [actually true in Iran, from what Persian friends tell me] and just want some drone-delivered democracy.