If you're talking about invitro-fertilization, I'm against that. I believe that life is life, in the strictest possible terms.
If one has unused fertilized eggs, they should never be destroyed.
Call me a nut or unreasonably old-fashioned, but it's how I feel.
What should we do with them then? In almost every fertility procedure a surplus of fertilized eggs is generated? There are thousands of frozen embryos in storage now.