This isn't the craziest idea in the world. Trolls can be distracting and a ton of garbage to discussions. This isn't one of those "evil Chinese laws" in my opinion.
But I guess I'm posting this as someone using their legal name so there's that.
Someone trolling an Internet discussion board shouldn't result in a federal law removing all privacy from everyone. The trolls might stop, but what about government critics who are now being silenced because they will be killed if they reveal their real name?
You might not have to worry about your government breaking down your door if you post something negative about your politicians. Some people in other countries do.
But I guess I'm posting this as someone using their legal name so there's that.