So they pay more to be in a highly-rated school district and thus, not only get a bigger mortgage but higher property taxes. Then they may send kinds to private schools on top of that.
Right. But that's their choice.
The jurisdiction has provided perfectly good public schools, which the resident is already paying for via their property taxes, but the parent wishes to send their child to a private school of their own choosing.
So the government says, "Oh, OK, if you're not going to be using the schools we've provided, then you can deduct the money you're spending in private tuition and get some of it refunded. No reason to charge you for schools you're not using."
But that same "perk" is not extended to child-free couples, even though the same logic applies (that is, property taxes paying for schools the couple has no intention of using). Just seems really unfair to me. Maybe I'm crazy.