The government can listen to what you say and watch what you do all they want. The moment they move from surveilling to censoring, from watching to interfering, the average citizen will come down on them with righteous fury. No one is coming to your door or telling you what lawful websites you can and can't look at or what you can say to people. It's a testament to the strength of our ideals that government agents can tap your phone and hear you say how much you hate them, and yet still not lift a finger against you [1].
Keeping an eye on quasi-legal websites and organizations is the government's job. Using force to harm them is a line that we cannot allow them to cross. There are many, many more documents that have yet to come to light and I'm sure that this community will be the first to point out any serious abuses of power.
[1] "That we know of"