You're welcome to make any argument about PRISM. But if your goal is to discredit the program and ensure others like it won't be established, the legal argument is stronger and more direct: Government programs can't violate constitutional rights, regardless of their efficacy. Period.
Why dance around your opponent when you know where to place a powerful right-hook?
Clearly the right-hook hasn't knocked them out yet - which is perhaps why even the strongest boxers supplement their fist power with at least a little foot movement.
Why dance around your opponent when you know where to place a powerful right-hook?