There were a few things that led to us recognizing and adjusting our biases. But what led us to homeschool ourselves was pretty straightforward.

My wife was a teacher in private schools for about 7 years, and once our oldest was ready for kindergarten, we decided that she could either go out and teach other people's kids, or she could homeschool and teach her own kids.

If I could pry further, that doesn't seem a "straightforward" answer to me, it sounds a little pat. Both my wife and I are teachers, and have kids, and we don't have a problem "teaching other people's children" -- that's why we went into teaching.

I assume the cost of the children's formal education (private school might have discounts for employees, but they still probably have to pay some fees), plus possibly the lower salary of teachers might have been a factor. (also daycare costs for the kids not school going age yet)

If they are saving money by not paying school fees, and having to transport family and wife to the school/daycare everyday, and they are getting a professional qualified teacher at home, with a very favourable teacher : student ratio and unlimited teaching time....

well I can understand why they are willing to take the hit of losing the teacher-spouse's salary.