But the same logic applies to vegetarianism and veganism. At best, a vegetarian can offer a defense of dairy and/or eggs: it would be unreasonable to claim that consuming dairy and/or eggs is ethically preferable to not consuming it. That is not to say that meat-eating is to vegetarianism as vegetarianism is to veganism: I consider vegans and vegetarians to be on the same side (I know some see the firmer line between consuming any animal products and not; I see the firmer line between consuming animal flesh and not).* And not all acts calling for a defensive ethic are equal: obvious some acts of choice can be defended, some can't be (or can't be as easily). But the parallel is there.
*I'm still a mostly vegan vegetarian--I haven't shaken the "mostly" yet. The purpose of a little-read blog is for self-wrestling.