That's where the fair use law comes into play, it's a persons constitutional right to view material in the privacy of their own home however they deem appropriate.
You bring up child porn, wow that's left field. We are not exploiting anybody or forcing anybody to do something they don't understand. If someone wants to take out a scene in a movie so they can watch it with their kids, then who are you or me or anybody to tell them that they can't. If they don't have the knowledge or technology to do so, but they still want it done, then give your movie that you purchased to someone that does have the knowledge and technology to take that scene out, and sure pay them for providing that service. That's your right.
Stealing is defined as "To take (the property of another) without right or permission."
We are not taking anything from Gibson or any other producer. These people have bought an original copy of the movie. All the royalties have been paid all the credit has been given. Now all these people have these movies in their home and they want to change them. Go ahead do it.