[1] https://www.wired.com/2016/11/ross-ulbrichts-lawyers-point-a...
[2] https://en.wikipedia.org/wiki/John_Connolly_(FBI)
There is also more to the problem than corrupt individuals. Sometimes incorrect attitudes (racism, mistrust of whistleblowers, unjust patriotism) can result in organizations doing awful and immoral things even if single members are not publicly charged with a crime.
Or when an organization believes it knows better than the constitution (https://en.wikipedia.org/wiki/James_R._Clapper#False_testimo...)
As I see it, the illegal and immoral activities of individiuals within acronym agencies comes down to group think, tribalism, and a removal of separation of powers which this country was founded on. If a DEA agent does it, I think that increases the odds the FBI will do it.
So, yes, the distinction is substantive.
If one out of 5 acronym agencies is corrupt, that's a 20% corruption rate.
Now of course one incident doesn't prove a whole organization is bad. But it does show the processes used by that organization have insufficient oversight to prevent it.
Moreover, it's not simply one case. Yes, the comment brought up an isolated case, but there are many more known cases, and I'm curious how many unknown cases there are....
I feel like your arguments have been willfully oversimplifying and I question what your dog in this fight is.