"We pinky swear to totes not enforce the law as written [unless and until we decide, with no notice or warning, to do so] up to and including criminal penalties". Not as reassuring as you claim it to be.
Governments can abuse their power to silence speech it doesn't like. Governments can use agitators to develop pretext for legal action. Governments can make examples out of small-time defendants to send chilling effects. Governments can have prosecutors who may not be evil, but merely overzealous and harmful.
At the end, it is about a default to freedom of speech and content online (short of objectively illegal content) or a default to self-censorship and closing the gates on open forums.
But if it's so simple, volunteer. Take on the criminal penalties yourself and perform the reviews.
Create a forum for supporters of (unfavourable person)? Sorry, your online complaints process isn't good enough, prison for you.