I disagree entirely. It's not just a matter of "I don't like it so no one else should have it." It's a matter of "our society has horrible and harmful ideas about women and right now this is perpetuating them." Their hearts are absolutely in the right place, the problem is that their screwed up about the cause and effect going on, they think that getting rid of porn will make people less sexist when in fact making people less sexist will make porn less sexist, and their solution would just make things worse.
I don't think it's wrong to ban something that perpetuates the notion that some people are less human than others, even if the people who are being dehumanized are willing participants. Especially since, in most cases, said dehumanization has limited their options as to what they can do. The problem is that, in this case, this isn't the way to fix it and this solution will cause more problems.
The porn industry has a lot of problems that need to be solved, and these folks are right to address them, they're just doing it wrong.