Well. We now acknowledge THAT is a problem, while we are on that slippery slope, we could re-word that to get to the heart of the matter:
"...one thing has remained consistently problematic: comments spoken or thought by people in discourse with others..."
Or to boil it down further:
"...one thing has remained consistently problematic: the private thoughts one is thinking, or is suspected of thinking..."
Orwell’s 1984 was required reading in Lit 101 in the 1950s. It’s probably banned from the library now.
http://www.goodreads.com/work/quotes/153313-nineteen-eighty-four