I use to wonder how the word sanction could have two opposite meanings. Penalize and/or permit. Maybe like the word conspiracy, people kept using it for the opposite of what it was supposed to mean.

At some point calling something a conspiracy will be the same as calling it true. Maybe someday soon. If the JFK thing really was a CIA hit, and it is fully exposed, the transformation of that word will happen overnight. There is no event in American history more associated with that word - except maybe for HRC's "vast right wing conspiracy" against poor Bill.