I might sacrifice a chimp to save the life of a human, but it is a sacrifice, the lesser of two evils, no better than sacrificing a mentally handicapped human.

I would consider it a sacrifice as well and I do care more about humans than other animals.

Much like if I have to choose who the trolley runs over I prefer it be a random cute young girl to my cute little young sister, I prefer it run over the chimp rather than the human.