[APBaer]

"They are taken from very early embryos left over from couples' attempts to have test-tube babies at fertility clinics."

They're left over and otherwise are going into the garbage,
it is reasonable to get some benefit for others.

[Psalm 73]

"They're left over and otherwise are going into the garbage, it is reasonable to get some benefit for others."

I am so sorry that you view human life in this way.
Would you also say that, as a large percentage of children in orphanages (esp. foreign), are "left over", and are destined for a type of "garbage" heap, then why not prevent their waste by harvesting their organs so that others may live?
Just think of the benefits to society - an almost limitless supply of hearts, kidneys, and eyes...