In the sixth grade during the early 1960s I was bussed to a half-black school near a ghetto in SF. It sucked big-time, but I only had to do it for one year. I couldn't see my sister doing it from second grade. Unless you're rich, the city of SF is a hell-hole for children, and is getting worse because of evil liberal controls.
My parents wanted to stay in the City, so they managed to put us into Catholic schools, even though they had very little money. We rented in the Marina and same thing, we would have been bussed to some horrible ghetto, late 60s/early 70s. My Catholic class was quite mixed, and naturally so, not forced down anyone’s throats.