Re: Denounce them all
Generally I think that there is the same level of denunciation. The issue here is that for many in the US, this agency (and others) are supposed to be there to protect the interests of their own country, and citizens like to suppose that this is them. Officials in power may, or may be seen to, disagree in some vague way. Also there are issues like constitutional protections and laws that this agency is reputed to be flouting even when democratically elected representatives, with supposed powers of oversight, try to hold them to account.
It is a similar situation to some UK citizens and their view of the comparable UK agencies.
The impression in many cases is that the agencies are slippery sorts who have decided to operate in an extra-legal manner. Its probably not entirely true as I don't imagine that they recruit entirely from "henchmen-r-us" and that most people join with a sense of wanting to do the right thing and protect their country/uphold the law etc, but certainly this impression has some traction and when even agencies such as the police that are supposed to operate with our consent ignore court rulings on storage of images, it really doesn't help their case.
The problem seems to be "we can do all this stuff and it really could help protect the public, but if they knew what we were capable of, they'd be frightened and then we could not protect them" so they are in some kind of Hobson's choice, and now that the public is more aware, some think we should have a more open and honest debate, although that might give away some secrets to "bag guys" (by which I mean criminals as well as quasi-state actors) and thus defeat the protections we currently generally enjoy.
Its a difficult area. To get back to your point about other countries' agencies, there is some condemnation of these there, although muted, but until we put out own house in order we can hardly thrown many stones.....