Can you explain how the founders intended to protect yelling fire in a crowded theater?
The courts ruled on that, because of the immediate and demonstrable harm from yelling fire in a theatre.
You don’t think there was an equivalent to porn in the days of the Founding Fathers? I can most assure you that porn is age-old and the Founding Fathers had access to porn if they wanted it.
Just like advanced guns, there was porn in the days of the Founding Fathers.
Or bomb on an airplane, for that matter.