Excellent point. Some people are misinformed about IVF and how it works. It is absolutely untrue that embryos (babies!) are killed to make one baby. IVF can be done 100% with respect for every embryo. If 20 embryos are created, the couple can put 2 or 3 back in, and freeze the others. The frozen ones can be put back for another try or donated to a loving couple just dying to have a baby. There are so many on waiting lists right now.
The truth is that we are fearfully made. It takes a LOT to make a human. G-d doesn't just let every sperm meet any egg and poof. 70-80% of the time when a sperm meets an egg, that embryo does not make it.
If a young, fertile, married couple is having regular relations (and always during her fertile time), it could easily take a year to conceive. However, sperm was meeting egg those other cycles (10-14 times in each year). What happens is that even in young women, a great percentage of her eggs are aneuploid (chromosomes not normal or normal in number). These eggs sometimes do result in a conception. Very few might result in a child with a genetic disorder, but most aneuploid eggs and embryos cannot keep dividing to become a baby. They really do stay embryos and have no chance at sticking around.
It is very important to understand that, whatever you feel personally about IVF. If embryos dying naturally is abhorrent to you, then no fertile people should have marital relations. It happens nearly every month. That is why doctors put back 2 or 3 embryos. IVF is costly. They know that most embryos don't have what it takes, regardless of how sperm met egg. They want the desperate couple to achieve a pregnancy. And the success rate of IVF is around 30%. That's about the chances a young fertile couple have of conceiving and staying pregnant, in any given month.
I cannot agree with you that donating one's own baby to another couple, when you conceived that child in an effort to have a child of your own, is giving "100% respect to every embryo." When a couple chooses to conceive a child it is their responsibility as his/her parents to raise and provide for that child.
Very few parents want to "donate" their babies to others, not knowing who is raising them or how they are being raised. Many therefore opt to have the "embryos" (babies) "destroyed" (killed) rather than "donating" the child or doing the right thing: having the baby themselves and raising the child that they intentionally conceived.
As far as your other justifications, I would like to see you post links to support your statement that 70-80% of the time embryos (babies) conceived in the womb do not make it.