Media companies like Parlor, Twitter, Facebook , etc. Can censor comments. These companies have legal agreements that exempt them from being sued for post they carry by agreeing to not censor comments. I'm suremi haven't explained this perfectly in a legal way but this general idea is fact. By censoring these companies are breaking their agreement. I wonder if they have broken the law??? I believe they are subject to losing their license to broadcast.
Do not, I repeat, do not convince the government to regulate the internet. You don't like a censoring site, don't use it. The government creates problems, they don't solve them.