All in all it is a difficult subject with no simple answers. A big grey area in the middle. Someone has to exercise judgement and decide the "purpose" of the forum. Without that the conspiracy theorists (and others) will gradually dominate.
This forum has had the "free and open" policy since day one, and it hasn't ruined the forum. Free energy, flat earthers, crowd funding scammers etc are free to join and disuss, but they usually don't last long because they get ridiculed or ignored.
Signal to noise ratio has always been very high, and time wasting threads usually just die into obscurity.
To be honest this forum does feel unmoderated at times, where some infamous "nutcases" will be ridiculed and bashed to virtual death. IMO it wouldn't be my choice on how to treat people.
Regarding OP, I think its fair to leave a discussion free and open in case of debate. Moderating on who is right or wrong is how you get echo chambers. Socially, some answers can still win a popularity content using "likes", though.
However, some topics can derail quite quickly. Someone asks how to talk to an I2C on a PIC16F, and in 10 posts we'll have opinionated bloat on 32-bit vs 16-bit 8-bit vs [insert fanboy MCU series], why no one should use a RTOS, and whether rhetorical-OP's choice of MPLAB+XC8 is still bearable. Again, the forums feels a bit unmoderated at times.
On the other hand, I also hang out on a Dutch IT/tech-nerd site which are very strict about off-topic posting, but they are also very strict on "misinformation". However, who/what is information is led to be judged by the average joe, which only confirms the Dunning-Kruger curve, and IMO this in turn facilitates echo chambers by marking individual comment(trees) as "BS". It leads to a lot of unfair moderation as anyone can vote(just like Reddit), and so, the first few voters who disagree with someone (or has something personal against it) basically get to pick the sentiment which "mainstream" folks (who just read to agree) will follow blindly. I'm not a fan of that system.
So in short, for all intents and purposes of this forum, it works. But with the gained insight that some cynical/bashing posts are better read when you're drunk, so you can forget them ASAP.