My political views are extremely public. A government knowing my political views is only bad in a situation where they start yanking rights from minority parties or some such awfulness. If the government goes that bad no possible amount of secrecy will make any difference.
Well, looking at the history of just your country we see that in the past 100 years people have been deported and imprisoned without trial for their political views, that careers and lifes have been destroyed. You also see a (voluntary or not) political segregation ( http://www.nytimes.com/2004/06/29/opinion/age-of-political-segregation.html ) and political parties in power restructuring voting districts to ensure they get the most votes no matter what, thereby invalidating your vote.
It leads to laws such as Indiana has just implemented, allowing people to discriminate against you because you don't think the same.
Basically I think society is moving forward at a pretty good clip and designing privacy laws around 18th century threats doesn't seem like the way to keep moving forward.
Edited by TasteTheRainbow