I don't think that was the idea, rather: fix the circumstances and the people will do the rest themselves.
> For example in India's case it would be madness to encourage even more fertility.
And fertility rates there haven't dropped as they did in the developed world, so it's really not the same issue.
That depends on the definition of "better". In purely material terms, the developed world is the best there ever was. Yet depression, drug abuse, loneliness etc are rising, so maybe humans require more than just material things.
For animals, living in a zoo is the best thing to do. Steady meals, a doctor on call and they'll even bring you mates to reproduce. Yet somehow, many animals in captivity don't want to breed, maybe it's similar for humans.