With this in mind, I agree with Bonheur's comment. A classification system is needed or a caution should be screened just after the opening credits. They were doing this for alcohol consumption (although the subtitle style would not work for the kind of scenes mentioned here), so why not do the same for violence and other unsuitable materials?
That said, I have to disagree with some aspects of the petition. I feel it is overly ambitious and unrealistic to expect censors to cut scenes of crimes like perjury or non-violent kidnapping. Jagdu, please don't be offended but where would the serial world be without these? I don't think serial dramas can function if these things are censored completely. Without second marriage, equal opportunity for women, zero crime rate - everyone would live in harmony and there would be no basis for drama! The important point to drive home is the ultimate triumph of good over evil, the immorality of crime, gender equality etc.