[Ditto]

Sounds like it borders on identity theft and fraud.

and if, for instance, some foreign diplomat is racking up charges at some porn site or titty bar, it could very be useful to know.

This is high stakes diplomacy, not you local city council meeting. All knowledge can be advantageous. I want to know everything possible about not only my adversaries, but also my 'friends.'

[Dubya-M-DeesWent2SyriaStupid!]

Business is business but credit card numbers?

To monitor what they buy? This is intel that is above Clinton’s pay grade.

[a fool in paradise]

They call it blackmail when you use such personal details to put your adversary over a barrel in negotiations.