This quote found off the Vegancats.com FAQ was rather shocking. I hope this isn't the Vegan 'Trump card'.
What is "natural" has never been the basis for what is ethical anyway. Rape is a perfectly "natural" reproductive strategy, utilized by many species, yet few would argue that this makes it okay. Morality is based on a vision of what ought to be, not on a dogmatic adherence to whatever has historically been.