Because it's always the responsibility of the tax collector? Because the government is the least cost avoider?
I used to work for a title search company that contracted with counties within that state to handle tax foreclosure. In order to foreclose on property for delinquent taxes, certified mail had to be sent to the most recent known address, the delinquency had to be published in a local paper, and a notice had to be posted on the property itself. I believe this is more-or-less the norm.
