I have no idea what Bill Gates thinks, and neither do you, I did not engage you in any argument simply posted a link to the complete talk so that people could look at the OP in context. Anyone reading these posts is perfectly able to make up their own mind what they believe, or don't.
I would advise anyone reading this, that if your worried about Bill Gates wanting to depopulate the world, go and research it yourself, and please use common sense and critical thinking, and avoid Conspiracy sites.