In addition to what tptacek said, taxes are paid with money which is an infinitely fungible commodity. Eminent domain confiscates a specific piece of property that cannot be precisely replaced.
I'm glad you've come around to my p.o.v. on property taxes!
The pros and cons of a mark to market capital gains tax are pretty far outside of the scope of this thread, so I will save my thoughts on them for another day.
You