So you will just arbitrarily define what is free speech and what is obscenity??? That is a good idea. Going down that road what if some day people in power started to define conservatism and christianity as obscene??? Should they then have the power to limit free speech?
Obscenity and explicit pornography were illegal until the 60s when the leftist SCOTUS, influenced by the leftist ACLU, decided that the citizenry would have no say in whether we wanted pornography or not. The pornographers rule, citizenry must obey.