We can agree on that (that this is the legislators’ reasoning). Whether it’s good or even valid reasoning remains to be seen. For one thing, the alternative to an adoption is one more parentless orphan - which is often also the alternative to an abortion. Oversimplifying the issue helps nobody. I’m not accusing you specifically of oversimplifying, as you made it clear that you were pointing out an oversimplification made by others.
It’s like this with any contriversial issue: most people adopt a manicheist stance, regardless of which side they’re on. This is why I think it’s important to always remember that if these issues weren’t nuanced, they wouldn’t be so controversial among so many different sectors of society.