Just remove it, The game is already dead, 343 must realise that if the want to keep the game alive they have to remove the aim assist. When I play swat with mouse and keyboard I usually get around 15 kills, I tried to switch to controller and it was so much easier and I ended up getting over 30 kills plenty of times. It not even fun to play when the game aims for you, you cant be proud of yourself since you didnt do -Yoink-.
Feel free to use the existing thread in MCC PC