I’m neck deep in the adoption world at the moment, and I’d say that it’s probably (almost certainly) because of some incorrect notions around the “types” of children that they think they might wind up with.
We get this with my mom. We have in our paperwork that we’d be okay with adopting a child with risk of mental or behavioral issues, or if the mother had had alcohol in the first trimester. Why? Because children we have on our own would be at risk of those things. But when we told that to my mom, she said something to the effect of “Well, you guys aren’t so desperate that you’d take just any baby.” Which is fucked up.
To some people, adoption is like shopping, and why settle for anything less than a genetically perfect Adonis who’s going to do well in school and probably never get cancer?
Sorry for being a little ranty.
Also, some people make a really big deal of their children being biologically their own. To carry on the bloodline or whatever. I don’t understand it, but I run into it a lot.