> We kill and injure plants and animals by the millions daily for our own sustenance. We're not 100% sure the former don't suffer either, and we know for a fact that the latter do.

be a vegetarian because plants can't fight back!
i mean really, that's the biggest difference between broccoli and cows.

> If we don't mind murdering a cow to provide a couple of hungry folks with their two all-beef patties on a sesame seed bun, why should we mind murdering an embryo to improve the lives of thousands of sick people?

murder is "the crime of unlawfully killing a person especially with malice aforethought". how does that apply to killing a cow? is killing the cow unlawful?