We've experimented on people, some "lower humans" tasted the king's food and it was considered normal. Some people are considered more important than others. Some draw the line with humans on either side of it. Others draw the line with animals on the same side as humans. Sometimes it's where you view yourself in the pecking order. Once it's a few steps removed we can live with experimenting. It's a complex problem and one that's here to stay. What we can do is keep order which the debate continues.