No one said the losses were similar.
They said loss.
Adoptive parents are normal people, actually. They too may have had difficult lives. Some of the most empathetic adoptive parents have suffered huge amounts of loss.
I stand by my statement that adoption was absolutely the least worst option for my children, and that is true. I am not making that statement for every child and situation, but I think adoption can be the least worst option, not in theory, but in reality.
I don't think people who think genetics are paramount to familial ties would make good adoptive parents. That isn't to say I disregard my own, my family's or my children's genetic links. Those links exist, they're just not the only way to be family, for us. Family is more than genetics, for some people, shared genetic material is not irrelevant, it's just not necessary to the familial bonds.
Some people bond, and become a family. Some people find people they have DNA in common with, and include them in the family. Some people focus only on them, their partner, and their 2.4 children. Some people aren't content unless it's 20 at the dinner table, including second cousin Maggie. Every family and situation is different.
Which is a good thing. No one should be guilted into adoption because they're infertile. No one should be adopted when there's any better option (this is the UK legal position- it has to be the last resort. The least worst option, as decided by a judge. Not a theory. Someone impartial, looking at the the evidence and deciding, as a Draconian measure.) Adoption can be a good way to form a family. But it's not for every one who wants to parent, and it's not for every child who cannot stay with their birth parents.