Karin Kolbe, author of "Why Milk Consumption is the Bigger Problem: Ethical Implications and Deaths per Calorie Created of Milk Compared to Meat Production" believes that the life time commitment of a dairy cow is more unethical than the one time slaughter of a cow fro meat production.
Anna E. Charlton and Gary L. Fancione, authors of "A ‘humanely’ killed animal is still killed – and that’s wrong" believe that the inconsistencies in the moral of killing animals is wrong. If a dog is killed by someone, how is that different than a mediacal professional euthanizing it? Death is still death and it is wrong.
Jane & Lane wright, authors of "VEGAN DEMOGRAPHICS 2017 – USA, AND THE WORLD" is an informational source, and provides demographics about the amount of, reason why, ethnicity, race, age, religion of vegans.