Reminds me of an old joke:
Q: What's the difference between a Christian Activist group and a pervert?
A: A pervert looks at pornography alone while the Christians form a committee and then look at it.
LOL!
If porn's affects were strictly affecting just the viewer, perhaps you would be right. But porn also affects those who participate in it including under-age children. Plus porn seems to induce a few more unstable individules onto more vile and even murderous activities (a la Ted Bundy).!
Sad.