The Neopagan Community is full of corrupt leadership enabling sex predators, cult leaders, and sociopaths, so I don’t think it’s a stretch to think that anyone saying you’re morally or ethically obligated to join a Pagan group is giving people very dangerous advice (I’m looking at you John Halstead).
Secondly, Paganism isn’t Activism, stop conflating the two. Paganism is not a Religion, but a large group of Religions with no agreed upon ethics, morals, philosophies, or political beliefs. If you care about the fate of the world and mankind, look to Activism and the Activist Communities, don’t expect all the members of a highly diverse subculture to agree about anything, politics especially.
Besides, Neopagans are still a minority, no way in hell can you change the world, because that is a matter of the masses uniting together towards common goals regardless of their personal religious inclinations or lack thereof, and not a smattering of fringe religious groups.