There's no valid reason why any government to spy on its citizens, specially one that prides itself of the freedoms it gives them while trying to make other governments give those same freedoms to their citizens.
It strikes me as ironic, that the US government has been doing just that. A government that prides itself about how many freedoms its citizens have, has in effect being breaching those freedoms by spying without a valid reason to do so. Even the reasoning behind it, that it's fighting terrorism, is not enough for people to accept losing its privacy over it.
No government has any business spying on any person without proving that it was a probable cause to believe that the person is involved in some sort of illegal activity. Such process should be transparent, and open to scrutiny by the people. The moment it's done behind the public's back, there is something intrinsically wrong with it and should be repealed. The citizens have the right to know how the government obtains the warrants to spy on them, and under which circumstances those warrants can be enabled to the be used.
Not only that, the citizen that has been targeted for a warrant to be spied upon should be notified on due time about it. And if it was given, what information was obtained and by who. Most importantly, that information should be destroyed if no case was able to be made against the individual. If there was enough to prosecute, that information needs to be safely stored so that only the interested parties can have access to it.
We need to make a stand so that no government spies on their citizens, since we need to be reassured that our privacy is respected wherever we happen to be. Governments having to prove that an individual's privacy needs to be intruded, has to be made each time and only for the information relevant for the case. If it can't, the permission is simply to be denied.