It is possible to think that a particular platform should be moderated heavily without thinking all platforms should be. It would be chaos if no forums had any

It is possible to think that a particular platform should be moderated heavily without thinking all platforms should be. It would be chaos if no forums had any heavy moderation, because some discussions can be easily derailed, and entire forums can be derailed with content not relevant to the topic. There is still value in having places where you can communicate and spread ideas online without certain views and opinions being censored. There is value in both approaches, and it is reasonable to prefer one approach on a targeted forum like Hacker News, and prefer another on a global social network like Facebook.