You bring up a good point. It's common knowledge that most countries have laws about spying on their own citizens, but not citizens of other nations. Furthermore, global intelligence organizations freely share intelligence. They have been using this "loophole" to effectively spy on their own citizens by proxy. It seems that it's in the best interest of all citizens of the world to form some sort of treaty that says they want spy on each other without due process. It's seems pretty counter intuitive that my own government would encourage, and even assist another government to spy on me. Isn't the main purpose of the government, the reason that I let the government exist in the first place, to protect me from foreign threats. Certainly another country spying on me is a threat worth protecting from.