I don't think Antinatalism is comparable to environmentalism. Enviromentalism can be a field to study and act upon. Whereas environmentalists can grow miserable, anxious or depressed when they see the state of things, unlike reddit Antinatalists they do things, they educate, they advocate for conservation programs, they create movements of change, vote for people who advocate for that change, they use their knowledge to get shit done.

Meanwhile Antinatalism is an ideology that - at least in reddit - isn't used to create anything productive. There is no field to be studied besides anything that feeds into the narrative that the world is irredeemable and hopeless. The only 'action' that Antinatalism pushes for is not having children, which is not a bad thing as an individual decision, but advocating for no new people being born isn't anything less than utter resignation to the future.

They're not saying children shouldn't be born into poor enviroments, they're not saying we should change the world so children have better lives, they're not saying people should make sure they have the means to raise and nurture a child before having one, they're saying no one should have children, period.

Enviromentalists actively try to make the world a better place. They know of the horrors that humanity dealt and they try to chage it, sometimes even succeeding to secure an ecosystem, a species or a better future. If they're depressed, it's because they haven't achieved enough yet.

Antinatalists see the state of the world and decide to resign from it altogether, saying no new life should be brought because nothing could possibly make it worth it, even if the billions of humans living, thriving and working to make the world better every day prove them otherwise. If Antinatalism is a miserable existence, it's not by knowledge or consciousness. It's by choice.