In all honesty, for all the freedom-related speech in the US and the so-called constitutionally protected rights against government corruption and abuse, I'm shocked that Americans are not in the streets rioting right now.
Watch the show Jericho for a pretty good idea of much of America thinks. I.e. people who had no beef with the government as it existed, but kinda fantasize about what would happen if the government collapsed and they were on their own.
It may help if you understand that these people don't trust the government to keep order. It's not wild-eyed anarchists who are buying that ammo.
Sure, there were some protests on Independence Day and I applaud the efforts of those involved, but it seems like regular Americans are largely either unaware or just don't care about it at all.
The 4th amendment is alive and well in America, at least as far as your typical white American voter is concerned. The most egregious violations happen to inner city minorities, who are so segregated from the rest of the population that the mainstream voter has probably never even met a black youth who has been stopped and frisked for no reason. And while you hear about no-knock warrant disasters in white neighborhoods, but it's extremely sporadic, to the point where your typical person probably can't say they know someone personally that it has happened to. And if you don't read the outrage blogs, you probably have never even heard of it. My parents have no idea what a "no-knock" warrant is. It just doesn't happen in their upscale Republican suburb.
But gun registration and licensing chaffes everyone. Even your most upstanding, law-abiding white American has to submit to a background check like some sort of criminal, and that makes people mad.