How do I convince my husband that morality is more important than gain?

To me, how you accomplish something is even more important than the accomplishment itself. Trump is a classes example of this. He's very wealthy and powerful, but he did it in an unethical way. Success really isn't anything to be proud of if you had to cheat to do it.

One example that pertains to our family right now is Redshirting. This is when the parents of a child born between October and December wait until their child is almost 6 to send them to Kindergarten, so that they will be older than their classmates and have an unfair advantage over them.

This is clearly cheating, as it's almost inevitable a child is going to come out on top when being compared to children a year younger than them. However, this is exactly what my husband wants to do. In 2021, our son will turn 5 in the first week of October, which means that he should be starting Kindergarten next Fall. However, he is insisting that we wait until the Fall of 2022, as this means he will consistently perform better than all of his classmates instead of performing worse than 3 quarters of his classmates, as would probably be the case if we sent him on time.

I'm not trying to deny that he'll do much better in school if we wait a year. Indeed, there are countless studies out there that prove that kids who are older almost always do better.

https://www.bbc.com/news/magazine-15490760

https://www.cultofpedagogy.com/academic-redshirting/

https://www.theatlantic.com/education/archive/2015/08/beyond-the-pros-and-cons-of-redshirting/401159/

I have no doubt that if we redshirt our son, he'll get straight A's and be in gifted programs all through school, win every class competition, be valedictorian, go off to one of HYP, and have a 6-figure-salary by his mid-twenties.

However, the reason I don't want to redshirt is simply because it's morally wrong. It would give him an unfair advantage over the rest of his classmates. I couldn't genuinely feel proud of my son for outperforming kids a year younger than him. I would feel much happier if he did okay playing by the rules than excel by cheating.

I've tried telling my husband this, but he doesn't seem to think there's anything unethical about this. He's also the breadwinner of the family, so what he says pretty much goes. How do I make him see that you sometimes have to give up what you desire in order to do what's right? Thank you in advance!