Earlier quoted context omitted.
Not to mention that people are biased and cannot be trusted to moderate ethically.
Whereas an algorithm can be trusted to moderate ethically? This is why civilized countries have developed rule of law, including arguments and rebuttals, overseen by an impartial arbiter. Yes, that is costly. But it is the accepted solution we have as a society, and it's time "Big Tech" starts accepting rule of law.
Yes, tech companies should accept the rule of law. But people need to accept that the rule of law does not preclude running a site full of angry, bigoted idiots with no productive commentary.