Moral panics also come from normal people who have felt the effect on their and their families' lives. For instance I am neither a prude nor a tea-totaler but I can see how many hours or my own life porn and alcohol have taken, hours that I sure enjoyed but that would have been better and as pleasantly invested in other activities. I know people that have sunk into porn addictions and lost their lives, including any ability to enjoy normal sex. And we all know what an alcoholic looks like. So is the ubiquitous availability of porn a good thing or a bad thing or something with nuance?
If you had a loved one disappear in world of Warcraft or a porn spiral you will start to question whether those are normal things that should remain so openly available without limits.
That has nothing to do with people erroneously blaming the "decay of society" or the "loss of traditional values" on things like rap music or videogames.
We can talk about how the internet has made things like porn ubiquitous, and how certain games are intensely addicting. But that is a wholly separate discussion.
If you had a loved one disappear in world of Warcraft or a porn spiral you will start to question whether those are normal things that should remain so openly available without limits.