Is it implied that Alex Mason did kill JFK after the events of Black Ops 1? Canonically, since Black Ops 2 follows Black Ops 1, I find it weird is nothing is mentioned about JFK in Black Ops 2.
In the final mission Mason confronts Dragovich, saying that the brainwashing Dragovich had attempted to do had failed, but Dragovich seems to remark otherwise "Oh?" & "Tried?". The final shot of the game, showing a film reel showing the president moving through a crowd with Mason as the final clip implies he was assassinated? Or not?
Best Answer
There is no concrete yes or no to this question, but as you have mentioned in the question and @Timmy Jim said in the comments, the implication is that he did, but it is not confirmed anywhere.
However, a scene from Black OPs II seems to insinuate that he did not end up killing JFK. From the wikia:
Therefore, unless the developers outright say so one way or the other, no one will really know what happened and it is left up to the player's imagination.