My freedom to swing my fist ends where your nose begins, the saying goes.
I don't like to turn on the TV and get porn content, and especially I don't like my children to be exposed to that content. I'm not opposed to porn content to exist, as long as it is somehow ringfenced from the access of minors. A majority of the population in the US agrees with this stance. Putting porn out in the open is like swinging a fist in their nose. It's not freedom, it's aggression.
If this argument feels unconvincing to you, just replace "porn" with "Holocaust denying propaganda", and read it again.