You're trying to figure out a decent ratio, and I'd like the total number of regretted treatments to become a permanent flat zero.
A child brought into this world learns from those who have walked on it for much much longer. It puts TRUST into them. The moment you have a single regretted treatment, that moment you have a human life who got failed by everyone around them. The social system, the government system, the family system. Systematically encouraging things where a regretted treatment can very well mean a life destroyed is not something I can ever support.
One's perception that life dealt them inadequate set of cards should never result in a borderline-militant push for a systemic change that reduces regretted treatments to a ratio number.