Let’s forget about the IQ factor in this scene and let’s think about good vs evil. Good people see Earth as a bad place at the moment and do not wish to create any further Humans. Bad people, however, think that the Earth is a good place at the moment and are ok with reproducing. This means that bad people will educate their kids in a bad way leading to an Earth filled with bad people. The world will naturally populate with evil and a reset is inevitable.

https://youtu.be/sP2tUW0HDHA