The goal of a scientific experiment can't be to "help" people. What you're describing is a political experiment. The goal of science can only be to learn whether it helps people, who it helps, who it hurts, etc.
> whenever you see some kind of large scale statistic that you think is not what it should be, the last thing you should do is concoct a large scale intervention to try to change it
aint that the truth.
Duplicating a top level comment I just posted, but this all assumes that people will generally respond the same way over time. I'd be surprised if culture, societal norms, life experiences, etc didn't make a meaningful difference and those absolutely change over time.