Even if what Keith were saying wasn't correct--and it largely is--the statement "I adore a food I refuse to harvest" doesn't even approximately describe any vegetarian position I know of. They are frankly saying "I refuse to kill sentient beings in order to eat them." From that perspective, there is no contradiction at all in liking the flavor of things that happen to taste like the cooked muscles of sentient beings.
Your artificial sweetener analogue is precisely on target with regard to liking the taste of meat and completely wrongheaded with regard to the motives of people who use it, who want the taste of sweetness without the consequence of weight gain, which, as far as they are concerned is a contingent and not an essential property of sugar. They could get the same effect by sufficiently increased exercise. They are after the same effect but don't come near your odd view of what they are doing.
I am with everybody else in finding your distinction between commission and omission beyond incomprehensible.
