You need some form of moderation. In the real world we interact with few enough people that we just ignore and don't be around people who don't contribute to th

You need some form of moderation. In the real world we interact with few enough people that we just ignore and don't be around people who don't contribute to the conversation. The internet doesn't allow this, you are talking with what a hundred posters in a single thread sometimes? Going across multiple threads it will be thousands of not tens of thousands even if you tend to focus on niche threads. Thus somebody needs to filter. And before somebody brings up OPs broken "if everybody talks we will be fine" argument the simple reality is that isn't true. The reason is filtering doesn't just happen on a person to person level. Much more importantly it happens on a site level. If people find what they are discussing isn't valuable they will leave the site. Once a group forms of those who want to cause chaos they will push away normal users. Thus your choices are choosing who you leave on your platform blocking those who would push away your user base, segregating your user base (ideally in a way that allows some cross pollination) to allow the chaos to be isolated from most users, or becomes just pure chaos ala 4chan. Note I am not saying you can't have good discussion without moderation. Certainly you can. It just isn't what the majority of content becomes. After all low effort content is low effort.