Vices like gambling, obscenity, prostitution, drugs, etc are banned or heavily controlled societies over because they have significant negative cultural effects. “Why do YOU care what other people do in their private lives?” was always a stupid justification: if everyone in your community is addicted to vices, that DOES affect me.
If so, how?
Should they be required watching in elementary school? If not, why not?
Looking at western culture (the only one I feel confident speaking about), we are still bound by puritanical values that were imposed as control mechanisms but managed to sneak their way into a set of cultural norms as a moral code despite their actual value to us not being evaluated and actively selected.
A strict definition might require content to have academic or intellectual value (implied by the remark about it being shown in an academic context) but this would also exclude a vast majority of non “obscene” content. Further, if you could swap the obscene elements for non obscene elements, I would argue the “value” of the content, as measured by its helpfulness, stays the same.
This all moot, however, as it’s likely not the right conversation to have. There is more useful discussion to be had on harm caused as a result rather than any sort of value judgement.
It's not a "western culture" thing. Many western cultures do, sure. Many eastern cultures do as well. Not literally puritanism and that specific history, but very similar kinds of thoughts and ideas.
So I think you're looking for another property those videos have in common. It might be closely related to obscenity, but I think it must be a bit more nuanced than that. Why are those videos valueless? (I don't know the answer).
This libertarian stance where neither you nor the state should care about how your neighbors lead their lives is the exception, not the norm, and it has its merits, but the cost of this ideology is obvious.
Do they? Citation needed. So far it seems that marijuana consumption leads to far less violence than alcohol, and proliferation of porn leads to much lower rates of sexual violence.
> if everyone in your community is addicted to vices, that DOES affect me
Then choose and manage your own community, but don't push this view on the whole country. Dozens of millions of people (I don't know what country do you live in, so not sure about the population) are not a "community" that you can put under the same norms. If you think that porn is bad, it's your right to do so, and to find likeminded people to build a community that shares these values. But why would you want to force it on other people?