@WM
Your position does not seem logical for several reasons, but I will address the midos question. There is not the same (disproportionately small) percentage of people with potential for good middos and ability to intervene successfully as there are superstar ballplayers.
This is why it’s so necessary to train our kids rigorously in bein adam lachaveiro. If they don’t have the information, some might get it from their learning, or a mussar sefer, but most will not absorb it by osmosis. By providing superior social learning opportunities, you won’t need outliers – you’ll have a bunch of inliers all with elevated levels of interpersonal skills.
We’re deeply entrenched in a culture that’s disrespectful and rewards those with bad middos. Many parents think sibling rivalry is something that can’t be helped. Who says we shouldn’t try? Learning to get along as kids is the best first building block to learning to get along with a spouse. Who knows, it might even circumvent the need for some Shalom Bayis interventions….