You just mathematically proved that there is no future.

But really, you went from person->society in a way that doesn't make any sense.

If there exist people who have internal stimulus, but they exist in the same society as the people needing external stimulus, what happens to the future of society?

I think you are assuming all people have to have internal/external stimuli, and reality is not gray. The reasoning doesn't make any sense. I feel like there is a lack of understanding and compassion for the differing levels of motivation in the dense diversity of individuals in society. And if someone needs some external stimuli and they get it and do a good thing, then that is a win. Why does it have to be so negative? I think it comes down to a negativity bias.