One of these things just doesn't belong,
Can you tell which thing is not like the others
By the time I finish my song ?"
Seriously, this may be one of the most misguided interpretations of the Fist Amendment. The ‘Right to Free Speech' was intended to protect citizens from the government if they chose to denounce it’s policies. It was combined with the right to free association so protests could be organized in the event government was no longer “for the people.”
As a secondary intent, free speech allowed for discourse among the citizenry those ideas which might be unpopular or even seditious. The Founding Fathers did not want to enfranchise the right to make money from illegal acts, especially ones involving cruelty to others.