Depopulation is a selfish global agenda focused on decreasing the human population for the benefit of the elite. People who unknowingly promote this type of agenda are acting irrationally and are viewing the condition of mankind through a very myopic lens.
Check out this clip of Bill Gates, as he makes the case for decreasing the rate of human growth:
This agenda essentially promotes inequality because it will ultimately relegate the poor and underprivileged to an inferior class of people, whose population will be carefully controlled.
Additionally, anyone who supports this agenda has failed to consider the creative intellect of mankind, which has continually enabled himself to dynamically improve his situation by changing the world around him. Mankind did not wait in the desert for food to grow in front of him. Instead, he changed his surrounding environment to allow water to irrigate new areas. Have we not forgotten the universe is immense and that man has traveled through space and has even walked on the moon?
Depopulation is not the answer. New ideas to improve the condition of mankind are what is needed.