Unfortunately for the ethical vegan, the production of their food alone reduces their claim [to superior ethics] to impossibility. Animals are killed in untold millions, in the course of plant agriculture. Some are killed accidentally in the course of mechanized farming; some are killed deliberately in the course of pest control. Animals are killed, every day. Every potato, every stick of celery, every cup of rice, and every carrot has a blood trail leading from field to plate.
Of course, cows are cuter than vermin. Or frogs. You have to draw the line somewhere.