What you accept as evil and what I may accept as evil and what Joe Blow that lives down the street thinks is evil are probably different, at least in degree.
A good example - adultery. I consider it very evil. Society doesn't and accepts it - witness how many of our elected leaders (both democrat and Republican), as well as "role models" for our youth, are adulterers.
Because I feel adultery is very evil, does that mean we should toss everybody in jail that has cheated on their spouse (and by proxy God), or had pre-marital sex or sex with somebody they weren't married to? No, of course not, for two reasons. Reason #1 - I don't want the government to have that kind of power needed to seek out adulterers (and who's going to police the police). Reason #2 - It's a religious belief that not everybody shares with me. I do not believe in forcing my religious beliefs upon others - it's un-American and I know God will deal with those who do so.
We even make laws against not wearing seatbelts.
and I don't agree with these laws. It's not the government's job to protect people from themselves. Unfortunately laws are pushed through by people or industries with money, not because of any kind of common sense.
But, why is it so hard to imagine the easy and cost effectiveness of simply saying that all hard core porn is now illegal. It wouldn't take much money at all to police it, only to incercerate, for some amount of time, people who willfully blow off the law. Corporate america would quickly get out of it and so would ma and pa. It would go underground and become much more scarce.
Why is this thought so repulsive to people who are not porn users? I suspect we have a lot of monkey spankers here who are waxing elloquent, or something, on the issue. But I have to wonder why people would argue against such a simple thing except for an irrational fear that making porn illegal would lead to the Taliban.