Given the chance, would you try human flesh?

Because, human's, especially western humans, have boundaries. With exceptions, cat's and dog's are our pets. They are what we love, and are part of our family (I hope you wouldn't eat your mother, but i'm not certain anything would stop you).

Cat's are our family, but cows are animals, they aren't let into the common home and they aren't house pets. Pig's aren't either. We have a sort of psychological separation of the two. Just like when you see someone you love (If you have the ability to love) you greet them kindly and embrace them, and when you see someone you hate you avoid them (or in your case eat them, unless that's how you show affection).

Sure, both people are human, yet you avoid one and treat the other one kindly. If you prefer dark chocolate over white chocolate, they are both fundamentally the same, yet you prefer one over the other, you like cherries but hate apples, the same thing, yet you don't touch the other. These are all examples of psychological boundaries, it's what gives us a personality. You will see these boundaries effect you on every single level. (rather you prefer a certain genre of movie, certain type of food, even a certain type of persone, i.e more serious or more satirical).

They are perfectly acceptable and almost used unconsciously, and they keep things in perfect order. You don't mention where they work 'against' your cannibalistic rationalization, yet you use relativity on the subject instead. By that i mean you rationalize it, you make it okay.

Please. Seek help.