First, I forgot to ping you to Posting #12.
I do understand why so many homeowners send their children to public schools. They attended them, their parents attended them, and virtually everyone they knew attended them. They can’t imagine that education can be done in any other way.
Yes, poverty of imagination certainly has a lot to do with it. Likewise, I suppose people whose families were homeowning are probably not going to think seriously about sacrificing that lifestyle by becoming apartment dwellers, for their children's educational improvement. But they could.