> the idea that once you own land, it's yours.

This idea is the problem. Taken to its logical conclusion, we get feudalism, where those who don't own land will forever pay rent the landed gentry, only because they were fortunate enough inherit land.

Property tax fixes this somewhat, but California decided to weaken that with Prop 13, and now is approaching feudalism. For example, in the apartment I lived in California, the rent paid would cover the landlord's property tax obligations in a month, and the remaining rent is the landlord's (minus whatever costs they have for maintenance).

> once you own land, it's yours.

Idea that you can buy a monopoly is generally a bad idea.

Clearly people don't think so, as the vast majority do agree with private property exclusive ownership.

Ownership of land by individuals within any national border is always subject to local government power (taxation, eminent domain, police power, escheat). True exclusive land ownership is prohibitively expensive for individuals, since it would require military defense.

Most people haven’t thought about it very deeply.

You were sold a lie. You don't own land today if you buy it.

Consider what the government would do if a huge oil deposit was found under your house.

Easily fixed by having an exception for people's primary place of residence. And other reasonable exceptions.