* It is hard, nearly impossible to avoid.
* In case of nonpayment the property serves as collateral.
* Land value depends mostly on public infrastructure paid with public funds - roads, subways, schools etc are all public goods that the property owner profits from via price appreciation but the general taxpayer pays for. So a linkage needs to be established. See https://en.wikipedia.org/wiki/Georgism
In the words of a famous conservative:
"Roads are made, streets are made, services are improved, electric light turns night into day, water is brought from reservoirs a hundred miles off in the mountains – and all the while the landlord sits still. Every one of those improvements is effected by the labor and cost of other people and the taxpayers. To not one of those improvements does the land monopolist, as a land monopolist, contribute, and yet by every one of them the value of his land is enhanced. He renders no service to the community, he contributes nothing to the general welfare, he contributes nothing to the process from which his own enrichment is derived ... the unearned increment on the land is reaped by the land monopolist in exact proportion, not to the service, but to the disservice done."