Interesting article and I completely agree that you can't be a hypocrite if you are a meat eater, .i.e, cat-dog-cow-snake-xyz are all the same. The only reason for not eating some form of meat if you are a meat eater is - you tasted it, didn't like it.
And I have to point out that I simply can not agree with the the psychological scientist Steve Loughnan... take for example India, ancient India to be more precise, it is considered to be one of the more vegan societies (side note: I am sure it was not 100% but mostly vegan) to have existed but had a very strong caste system (hierarchy in society based on birth) that is practiced till date... so very doubtful of that argument.