Government doesn't have a right to meticulous transcriptions of every verbal conversation you've ever had. But, it does have a right to do its utmost to figure out what was said. It has a right to search your file cabinet, or tap your phone, or tail you with a detective, with a warrant of course.

Does it though? A right? Like your right to freedom of thought? That's big! Would you think this if a judge hadn't ruled this way?

Because in our system it's not the judge who can make that call, it's you (theoretically a citizen) who grants the government the authority to take certain (constitutionally limited) actions as long as it serves the people.

If the government has a "right" to tap your phone they have the same right to plant a microphone on you, and at that, they do have a right to every verbal conversation you've had. Because they can get one from the other.