Say what?
Have you played a fps on pc before? If pc gamers and console gamers played against each other, it would be a masacre. Sure auto aim helps alot, but u can never be as fast and acurate with a controller as u can with kb/m. Its a far superior input device for aiming.
Yea no, we're not having this discussion here. You'd think because of the 1:1 motion the kb/m setup provides it's be a no brainer and objective winner but it isn't "that" clear, and you'll know that if you are good at both...you won't if you suck at one and are good at the other. Because of this I'll just say that it won't be a massacre, how do I know? Cause I myself have played games on PC against other people while using a controller and I have often even ended up top of the table. Sure it depends on the games in that in a game like counter strike the controller guy would be heavily disadvantaged but not every game is counter strike and the gulf is not as big everywhere...infact controller works better for some shooters like Gears of War which are heavily movement based there's some stuff with wall bouncing, camera resetting tricks and slide cancel that you just would not be able to do with a keyboard because of how they work...again I know this because I have played Gears at a very high level for a few thousand hours.
In any case you are assuming every PC gamer plays like fatality from Quake and every console gamer plays like an old grandpa with slow reflexes, when the reality is very different from that.
You should have a look at some of Nghtly, Triple wreck or Unstable's videos to see how quick and accurate someone can be with controllers in Destiny.
A player this can go up against most (if not any) of the KB/M players very easily under similar conditions, and he surely won't get "massacred"
https://www.youtube.com/watch?v=uImzxADTidM&feature=youtu.be
KB/M is a better setup but the gulf between a controller and a KB/M player is not the same for every game.