Personally, I don't feel it's necessarily unethical to perform experiments on human embryos to begin with. Embryos are not conscious beings, nor do they feel pain (although fetuses do, at around the 5th-6th month). To me it is not much different from experiments involving stems cells, human tissue, or what have you.

But even if you did object to the idea, the embryos in this experiment were non-viable, meaning that they were never going to become human beings. I think omitting that word from the headline made it that much more inflammatory.