Comment: Yes

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Yes

They are currently capturing password data and it is easy for them to accomplish.

An NSA analyst can easily sign in anywhere to anything as anyone so the ability for an analyst to impersonate somebody else is at their finger tips.

In addition to passive 'listening in' type stuff, the ability for them to use that data (steal identities and wrongly impersonate people) is a great danger and source of potentially endless confusion.

Its the information war equivalent of a nuclear weapon. Even if we defunded the NSA right now, the technology and know-how already exist so the operation would go rogue and continue since there is too much to be gained. Its another evil genie that will never be put back in the lamp.