>When the day comes that this information is obtained and used against the same politicians who voted for it, it will be some delicious comeuppance.
I really don't think you quite get how that day would work.
"Senator, PRISM has discovered an email of you admitting to having a gay lover in college, something that would make you completely unelectable in this country for some reason."
"Ahh. Johnny Ten Inches. Yes, well, I admit to that. How much is it going to cost for this to go away?"
"We have all the money we need, but it would sure be nice if that new NSA data seizure legislation in the pipeline got a yes vote. #211,944 if I recall."
"#211,944? I'm not familiar with it."
"Of course you aren't, senator. We haven't written it yet."
You are describing authorized use by those officials who have access to the system.
We were talking about unauthorized use by outside attackers who manage to compromise said system. The post to which I replied spelled this out explicitly and I quoted that in my own post.
See how simple that is?