I care more about how it's warming people up for more age verification and other censorship laws. I don't really care what happens to porn producers. Most of which are exploitative, abusive, and many times downright criminal. There is a non-moral argument to specifically target porn. Your libertarian argument falls flat on it's face when you start looking into who owns the majority of porn and what they've been known for. Extend this to OnlyFans, which simply turned pimps into shareholders. This is of course the fundamental problem with libertarians in general. They stand for absolutely nothing ("allow everything" is not a stance) which makes them simultaneously the worst ally to have and a formidable enemy to societal security.

The moral argument however is worth considering. Numerous well cited studies have discussed the deliterious effects of porn consumption. Porn (over)consumption directly correlates to loneliness, especially among males, for example. It also correlates to poorer relationship outcomes, increases in the rate of STDs, and other interpersonal issues. In general, porn is no different than any other drug with all the downsides associated.

We cannot say the same for "mainstream entertainment centered on murder". Murder in general has trended down year over year since the 60s. One would be able to make a stronger counter argument: the exposure to violent media has possibly made violence less appealing. You are bordering on using "violent video games create violent people" as proof we should not view porn differently. These are not the same argument as shown by a trivial search of elsevier.

Tl;dr

Nah, actually I did read it but I disagree. I don't want people imposing their morals on me. Adults are responsible for their actions