You seem to be implying that in the US, we do trust our government, and you seem to be assuming that the US government will not use this technology to spy on its own citizens. Both are false.

What keeps our government from being like those of certain other countries is not that it's trustworthy, but that the different branches of government can hold each other in check, and that we as citizens have certain rights to hold each branch in check. When people imply that we can, do, or should trust our government, they're missing the point.