He didn't believe humans were altruistic by nature, he believed they could be nurtured to be in an environment that rewards it. He was very much into behaviori

He didn't believe humans were altruistic by nature, he believed they could be nurtured to be in an environment that rewards it. He was very much into behaviorism (B.F. Skinner) and similar concepts. The question whether such an environment can be designed and sustained is still open. However, if it requires a "societal collapse" to have his ideas adopted, then I'd rather expect the outcome to be more like a totalitarian communist regime. The road to hell is paved with good intentions.