I see what you're saying -- that's true in the case of addiction. I don't know that addiction is the right model for consumption of animal products, given that you can reduce your consumption of them (I have!) without triggering as much of a biological feedback loop geared to get you to increase consumption. It's not a totally inappropriate metaphor, though. I agree, we probably just have a difference of approach here.

I'd still suggest that delivering the message in a way that is more empathetic towards the person trying to make the change would be likely to get better results in terms of changing minds.