Earlier quoted context omitted.
Sticks and stones may break my bones, but words will never hurt me. Words are just words. One may hear or read words that provoke them to violence or other negative behavior but blaming the speech in whole or in part removes agency from those who choose to react in a negative way.
There's an analogy to campaign reform. Individuals can choose to bribe politicians, and the politicians can choose to accept the cash and otherwise not modify their voting behaviour. Yet in the real world we can see what Citizend United actualy did.
Citizens United was about campaigning for them independently. Something that was already legal for individuals to do.
I agree second order effects are a problem, but this is widespread in govt (e.g. they buy votes with some narrowly-defined program like govt employee pensions or local pork spending). Maybe the problem is that the power and wealth that comes with being elected is too attractive, and is what we need to somehow fix.