The businesses that own those congressmen are being negatively impacted by the surveillance state. The US can no longer be taken seriously for security products globally because the NSA has to have a finger in every pie, and a plethora of vulnerabilities in every product.
We have the best government many can buy. It just takes time for that money to get in the hands of the large multinational corporations who can be trusted to take the most profitable path. Once the laws start to directly conflict with the ability of those companies to make a profit, and the lucrative government contracts dry up so it's no longer profitable to support the surveillance state, those companies will fight to repeal those laws, unless a third, more profitable option appears. The government would be in a real bad position now if they couldn't just arbitrarily print unlimited sums of money to keep that contract option going.
Of course, this is probably why a lot of people feel it necessary to prepare for the collapse of western civilization.