For those claiming that games are no different to books or movies, bullshit, there is a very clear difference between watching a fictional someone decide to kill a fictional someone, making the decision yourself.
And I agree with what Atkinson has said in the purely literal sense, you don't need ver the top violence to enjoy games.
That's not to say that I agree with his aim however. As has been stated, the percentage of people unable to differentiate games and reality is minimal, and if games don't set them off something else will. Adults get to make their own decisions on their viewing and gaming material, as long as the production of said material doesn't cause anyone harm then you don't have the right to stop them*.
*Obviously they have the legal rights to do so, but I'm talking about more universal human rights.