Being vegan is not a matter of "lifestyle." It is a matter of fundamental moral obligation. Is being vegan a matter of "choice"? Only insofar as we are able to choose to ignore our moral obligations not to exploit the vulnerable.

Domesticated animals such as dogs and cats are vulnerable and entirely dependent on us for all of their needs. They live very unnatural lives because they are not part of the human world and they are not part of the animal world.

So it is always preferable to discuss the matter of veganism in a non-judgemental way. Remember that to most people, eating flesh or dairy and using animal products such as leather, wool, and silk, is as normal as breathing air or drinking water. A person who consumes dairy or uses animal products is not necessarily or usually what a recent and unpopular American president labelled an "evil doer.

To say that a being who is sentient has no interest in continuing to live is like saying that a being with eyes has no interest in continuing to see. Death—however “humane”—is a harm for humans and nonhumans alike.

It's really not rocket science. If animals are not mere things; if they have moral value, we cannot justify eating, wearing, or using them particularly when we have no better reason than palate pleasure or fashion. If you are eating, wearing, or using animals, then your actions say that you regard them as mere things, despite what your words say.

I certainly believe that we have a moral obligation to care for the dogs, cats, and other nonhumans whose existence we have caused or facilitated as part of the institution of 'pet' ownership. But I maintain that we ought to abolish the institution and stop causing or facilitating the existence of more 'companion' animals.

There is no difference between sitting around the pit watching dogs fight and sitting around a summer barbecue roasting the corpses of tortured animals or enjoying the dairy or eggs from tortured animals.