Might want to talk to less braindead hippies then. Most of them are not for mandatory population control, and they are quite realistic. Most of them do not want to return to caves and roots. And it is silly if you really think that. Try interacting with them for real and listen to the smart hippies, and not just parrot what the retards of the movement said.
(Else cataclysm becomes: They wanted to add zombie fetusses and abortion clinics! And they want all players to randomly die! Etc).
Surprisingly a lot of groups which you might have kneejerk reactions towards are not that stupid or unrealistic. Try interacting with them. Or, perhaps, just reading their online forums. Focus on the positive things they want/do not the outrageous comments some of them make.
Once was looting a town at night during a thunderstorm, the flashes where you could see all the Z’s were very interesting and fun.
And apart from that I agree with inadequate, it is a silly idea and was removed for a good reason.