We are assured that the embryos used for these experiments, leftovers from fertility clinics, would have been destroyed anyway. They were just going to waste. Good and evil aren't absolutes, we're told. They meet and merge, like parallel lines headed for some distant horizon. That may be only an illusion, but for now it serves our scientific purposes well enough.
Boundaries exist to be crossed.
And once we cross them, it'll be as if those old lines between good and evil, between reverence for life and scientific curiosity, had never existed. Nothing has so degraded our ethics in this modern era as our ethicists. The great champion of infanticide at Princeton University, Peter Singer, is after all a professor of, yes, bioethics. It is astounding what a supposedly civilized society will routinely accept. Experimentation along those lines has shown good results.