That's just bad advice. How can you ban bad advice? I can't imagine what society would be like if nonprofessionals had liability for the harms that came to other people as a result of acting on their opinions, the way we have liabilities for doctors or lawyers in a client-provider relationship. Yeesh, you'd be putting people in jail for the crime of being dumb online.

All you've been doing is mischaracterizing things to the point of absurdity and then pointing out how your mischaracterizations are absurd.

Propaganda can be harmful even if hasn't programmed anyone to welcome an invader with open arms.

Nobody was put in jail for writing poetry. They were put in jail for praising North Korea.

Banning the praise of North Korea isn't banning bad advice.

If the person had been speaking into a microphone instead you'd be telling me how South Korea outlawed talking.