“For one thing, we know what the files are even if we can’t read them.”
No, we may know what the name or a short description of the files are, but we can’t possibly know exactly what the contents are unless we can actually read them.
“For another, there are people that have read them and they’ve said so.”
Oh, great, why don’t we just let these people read all the files for us and save us the trouble or releasing them at all then? I’m sure we can trust them to tell us if there is anything really juicy. It’s not like anyone associated with the government would ever lie to the public or anything.
Which doesn't contradict what I said.
"It’s not like anyone associated with the government would ever lie to the public or anything."
Yet not everyone associated with the government lies all the time either. The fact is, if there were a big secret remaining in these files the very people who have read them would say there was and want them to get out, or say there isn't and want them to be hidden. But what they are saying is that there isn't one, and they want them to be released.
It's irrational to assume that everything is a plot. Some things are what they are.