All those anecdotes do not prove anything. To prove that pornography leads to sex crimes, you have to explain why there are hundreds of thousands of other people who read pornographic magazines or watch X-rated films but do not become sex criminals. In the 1970s, the US Commission on Obscenity and Pornography published nine volumes of technical reports on the topic. The overall conclusion was that it was difficult to demonstrate that pornography had any substantial effect on the occurrence of sexual crimes. In 1979 the British Committee on Obscenity and Film Censorship did another study and came up with conclusions similar to those of the Americans.
Human behavior is too complex to be explained through monocausal theories.
The incidence of rape dropped in Denmark after they legalized pornography, but that fact isn't being used either to claim that pornography reduces rape. Our behavior is shaped by attitudes and values acquired at home and with peer groups. These attitudes do not change by viewing one pornographic film, or even a succession of X-rated material. If indeed pornography mechanically incites people to sexual crime then the censors themselves would be in dire danger. This is not the place to go into a long discussion of rape and its causes.