That said, it seems you're assuming comments are simply a one-way output of different people's thought patterns, rather than a two-way process that has an effect on others. It's obvious it has a two-way effect - the point of reading and listening is to learn, and we can learn in ways that make us worse off.
The idea that we should have a super low-friction way to be exposed to the internal thought process of anybody who is motivated to post those is an idea worth challenging, and we're starting to wake up to just how negative the repercussions of it are. That level of reach without any filtering steps (such as community standards, social feedback loops, etc) is fuel for extremism, harassment, and triggering/exacerbating mental illness. Lets not give everyone PTSD if we don't have to, cause thats effectively what your argument boils down to.