1. >It's not the tax that's the problem. It's a law which lets them seize the land for a few dollars in unpaid tax.
What happens if they refuse to pay the tax, then? As an agent of the state, how do you make them pay? You might send them some letters with warnings. Of course then they might continue to shirk the law. You can ratchet up the tax, by charging interest. Ok, but that's a number. They still refuse to pay. How do you make them pay?
2. your logic is questionable:
>Property is a huge investment, driven by unsophisticated retail investors (who may be putting most of their life's savings into a single home), prone to stupid fluctuations, which can destroy the lives of normal people when it does something funny. Taxing it helps keep it a little rational (as the taxes will encourage people to avoid it when it starts heating up).
Having children is a huge investment, driven by unsophisticated people, prone to stupid fluctuations, which can destroy the lives of normal people when it does something funny. Taxing childbirth helps keep it a little rational (as the taxes will encourage people to avoid sex when it starts heating up)
Does that sound like reasonable public policy?
And aside from the policy ethics I strongly doubt your model that property taxation is a significant 'tempering agent'. If you're going to call the buyer an 'unsophisticated retail investor', it's unlikely to presume that they will have a 'sophisticated' concept of property taxation, either, especially when the government can change its parameters at will.
Finally, if you're going to argue that property taxation is supposed to be a detterent for people who you are codedly calling 'unsophisticated' (whether or accurate or not, that reads to me as 'poor people') to 'rash' purchases, well, thank you for demonstrating my point that it's tax with regressive outcomes.
If you can show me a citation indicating that property tax keeps housing prices 'rational', I'd give it a second thought.