Those of us who are (or were) home with our kids do it because we don't want our kids raised by other people in those accommodations, we want to be the ones to raise them, to see their first steps, to hear their first words, to care for them when they are sick and scared and need their mothers to be there (I've been a parent for 27 years, one thing I know: You can't schedule NEED.) when they walk in the door after school, even if it was a bad day or a great day.
This is exactly why DH and I decided before I got pregnant that I would stay home full time, even into school age. And it's surprising to me that the "raised by other people" idea is offensive. I genuinely don't understand. Right or wrong, that's how my husband and I have always described it. We don't want anyone else raising our child. And for the record, although his hours are unique and afford him quite a bit of pseudo SAHD time, he always says that I'm the one primarily raising our daughter. I'm the one doing it full time. So, maybe that's why we truly do think of consistent day care as someone else raising a child.
I like this "reason." Short and sweet. :-)