Re: ..only politicians (and their spooks) and people with a surfeit of money want this? I
Why? Because they can.
Nope, because they hope they can use it to political advantage. Like finding dirt on their political opponents. Like finding the terrible people who propose voting the other bastards into power so they can be targeted.
It's just another step along the way to authoritarian totalitarianism. Gotta do it while we're still in power because if the other guys get into power they'll do it and use it against us.