Why not? It is an option if career and lifestyle is more important.
And there are different degrees of "more important". "Throwing the kids away" is a super extreme measure few would take.
I hate it when during internet discussions, suddenly the other side slides on a slippery slope all the way to Level 99.
Your single without children?
Adoption may be the best option for some people in some situations. I can imagine that. But presenting it as an obvious solution to this problem indicates a glaring gap in their understanding of human beings.