Do you have the right to say what is a toxic product when it involves something as subjective as the mind and its response? Do you have the right to restrict others creating what they wish to create? And if you do then do they not conversely have the right to do just what you have listed.
You want to use extreme examples yet in so doing you revert back to individual skills and abilities.
None of these form a collective but are examples of the individuals within a collective with their own consciousnesses that are not in full part of the collective but on some level partially free and possibly partially under the thrall of the collective consciousness just as every individual.
Heroin has purely subjective effects on mind like porn? Because those effects on the brain come from the change of mental state while Heroin goes straight for the physical body and then the mind. That is like saying a video that is depressing should be compared to dipping your hand in acid in how it affects people.
Yet even heroin can be overcome if one chooses to do so. We both have no doubt heard of people able to use their will and power to cure all manner of diseases practically overnight such as cancer and other terminal illnesses. Perhaps you are underestimating the potential power and will the average person can use once they wake up and pull their mind out of the gutter. Especially when it comes to control over their own body.
In fact your own argument about diversity discounts your argument about the dangers posed by porn as among that diversity are many that are not susceptible and not subject to those dangers. So again the individual will tend to excel when measured against the collective which operates as a single entity in such cases which is what we as magicians are actively moving ourselves away from on our own paths. Which is what everyone will do in their own way in their own time.