I cant help but feel that disposable consumerism, resource plundering and greed which are exalted in most isms are the reasons why there might be an issue with endless population growth.

The only way any of this ever changes is if we actually act. Protesting to revert back to what has failed the people in the past seems so counter productive to me. The only sensible thing to do is to create a better way, such as one that is not ground in materialism or any other current or past ism for that matter.