I am in deep agreement with the thrust of your argument, particularly parents job in relation to "the tyranny of their own desires".

However, I can't agree with "Perhaps the hardest thing to do is to realize that the way your kids turn out is largely due to how effectively you and your partner parent."

If you mean you as a parent will have an enormous impact on your child's life-arc, I certainly agree. But who a child is is often not nearly as malleable as parents, and especially non-parents think. Parenting matters enormously, but I can't agree how a child turns out is "largely" due to parenting.