I HATE this kind of games because my fear is that this thing can happen to my wife/girlfriend/sister . Really disturbing.
Just for the record, your problem is that you blame real life problems on stories like this, as if people don't know what sexual slavery is if not for these games. If a person commits murder because he saw murder in Hollywood movies, that's his problem. Normal people know the difference between reality and fiction.
If anyone does something like this in real life, I fully support punishing him with the full might of the law, even death penalty isn't off the table in my opinion, but that's up to every country to decide what their laws are.
However, I am allowed to fantasise and write whatever. If we censor stories with morality, there would be no stories with murder, theft, robberies, rape, kidnapping, war, torture, massacre and whatnot, all of our stories would only feature positivity. At that point, I wonder if we are still living in this world. That sounds more like Heaven to me.