I had to Google "man-o-sphere". Is it particularly more dangerous or toxic than other identity-based activist communities? Genuinely curious to know

The "man-o-sphere" is pornographic. Look at the porn-brained Tate brothers for an example. That is their whole ethos and their souls are rotted out by it. Both are based in dehumanization and contempt for women and draws from the well of insecurity, viciousness, and psychological disorder. Both entrench and deepen psychological disorder and immorality.

I think the basic error is that we're making a concession to obscene content and the sophists in our midst who have spent decades deploying the garbage of moral relativism and fallacious appeals to "freedom" to defend evil. The argument for age verification here is weakened if, instead, the production and distribution of pornography is outlawed.

That you cannot perfectly enforce the law doesn't mean the law has no value or function. The purpose of the law is not undermined by imperfect enforcement, and it isn't exhausted by enforceability. Law is a teacher. Anti-porn laws would still carry psychological and social weight. They are a declaration of what is not tolerated and what is not good and contributes to the stigmatization of bad things. That creates a higher hurdle in people's minds to seek out and engage in such activity and creates shame around such activities that itself dissuades.

I would also add that pornography and drugs have a history of being used in psychological warfare. Oligarchs ruining society? Allow pornography and it will absorb people's attention and cripple them emotionally and rationally to neutralize them. Or consider the recent loosening of drug laws or debate about loosing them - which I do not accept is coincidental - to give people another dulling and numbing agent and an escape. It is in the corrupt interests of an oligarchic elite to corral the herd. The police baton is painful and creates a dangerous indignation and resentment, but pornography and drugs do not.

Manosphere content is toxic and harmful but the hyperviolence and desensitisation of the former should not be downplayed. That's where the mass shooters evidently come from.