It's not different at all, the point is not whether the porn is illegal or not, the point is the porn portrays an act which is illegal and the evidence shows that people searching out that porn are far more likely to commit the offence. Far from acting as a release mechanism - at the very least it correlates with carrying out the act. I haven't claimed it is either a cause or a gateway, on that score I frankly have no idea and thus can't comment, merely an indicator.
The same logic could just as easily apply to any harmful sexual crime, actively seeking out media portraying that act would indicate a propensity to commit it. There is no reason to presuppose rape porn (or in this case holoporn) would be different. Someone who seeks it out has already gone beyond the point of having fleeting thoughts and despite Timo's insistence there really is strong evidence to correlate that step with actually committing the offence.
The same logic could just as easily apply to any harmful sexual crime, actively seeking out media portraying that act would indicate a propensity to commit it. There is no reason to presuppose rape porn (or in this case holoporn) would be different. Someone who seeks it out has already gone beyond the point of having fleeting thoughts and despite Timo's insistence there really is strong evidence to correlate that step with actually committing the offence.