Advanced persistent threats can exist in any and every one of our computer systems. At any time a government can flip a switch and force us to pay some tax in Bitcoins? Just because it's not a new concept it does not mean that governments around the world are not assembling cyber armies and militias to do exactly this kind of stuff.

So if Bitcoin were made completely anonymous then what could we do to protect ourselves from government sponsored attacks on Bitcoin users whether by phishing, by bribery, by ransomware extortion, malware, or anything else?
Remember this: http://en.wikipedia.org/wiki/Sony_BMG_copy_protection_rootkit_scandal
Sweeping the problem under the rug will not help Bitcoin go mainstream. People like us might be considered security experts but the vast majority of Bitcoin users of the future will not be and we don't want the reason for Bitcoin to fail to be that hackers can manipulate and target the users.