Veganism makes the statement that slavery is wrong
Why should vegans lie to non-vegans about the virtues of abstaining from one kind of product of exploitation (i.e., flesh) but not all others (i.e., forced use, skin, secretions, blood, bones, etc.)? Veganism hits at the heart of the matter. That is, veganism makes the statement that slavery is wrong. Vegetarianism, on the other hand, simply states that slaves should be used to death just like any other form of non-veganism.
Think, then Go Vegan!