Your assumption is that legal speech has no negative real-world consequences. But look at the mass shooter Dylan Roof, among others. They targeted minorities a

Your assumption is that legal speech has no negative real-world consequences. But look at the mass shooter Dylan Roof, among others. They targeted minorities and were solely radicalized in online forums according to their manifestos. Or, look at the strain on hospitals that anti-vaxxers put us through. These people were partly influenced by online misinformation. Concerns about speech in the age of social media have little to do with A's speech impacting person B. It's A's speech influencing person X, Y and Z which then has an unpredictable negative impact on person B. This wasn't a big problem 15 years ago before social media. It's a new problem and many people haven't updated their paradigm given the new environment we're now in.