Ahh, but if I die of starvation, I can’t very well make people happy, now can I? Assuming everyone followed the thought’s direction, the way to best make people happy is for me to live a healthy and long life, probably. (Of course, it’d be up to each individual to determine how to best make other people happy. Maybe I would decide that my contribution to climate change was causing unhappiness, so I would end my life.)