I believe that it is in the interest of all bitcoin users to keep bitcoin free from government influence.
I propose to add a blacklist of all addresses that are associated with government, so that no one can send bitcoin to or retrieve them from the blacklisted addresses. The bitcoin miners and clients should refuse to validate transactions containing a blacklisted address.
That will make bitcoin taxation harder if not impossible, and will make it cost prohibitive to seize and thus regulate bitcoin.
Every bitcoin client should be free to make a custom blacklist or download one from the internet.
It isn't a good idea at all. The community cannot for certain, determine which addresses belongs to the government. Bitcoin taxation is only incurred when it is declared and is paid in fiat. It isn't beneficial for Bitcoin to reject regulations. Regulations can help Bitcoin instead of harming it.
Miners are probably the most important factor here. If the miners were to implement such a rule, their farms would probably all be shut down.