“To what degree do homeowners owe a duty of support to non-homeowners in their pursuit of homeownership?”

Nothing. But they are entitled to their property and nothing else. Purchasing a property doesn’t mean your neighborhood is suddenly frozen in time from that point onward, and you are entitled to never have your neighborhood change. So no, you don’t get to tell everyone else what they can and can’t build on their property.

So if a developer wants to buy up some lots and build some higher density housing because there is extreme market demand for it, tough luck. If one does’t want their neighborhood to ever change, they can feel free to purchase every lot in the town. The “neighborhood character” of your neighborhood was once just forests and cornfields. Why was it okay to ruin that “neighborhood character” to build your neighborhood, but once you purchase property, suddenly now everything must remain frozen in time?

“Do you want to live in a society where a younger version of yourself could no longer buy a home?”

That’s exactly where we are heading because of all the “I got mine, fuck everybody else” NIMBYs block more housing from being built.

“How does it make you feel to see other people enjoy the financial and physical security of owning their home?”

They are welcome to enjoy that. But nowhere does their deed say they are entitled to never have their town or neighborhood ever change.