Choice is a pretty loaded term the way you're using it. If I chose to have sex with whats regarded as very good protection and birth control, and I still get pregnant, did I opt in to having them or are they an unlikely product of a different but related choice? Is it just 100% on me if the support structure I rely on to raise the kids I did opt in to having crumbles for some reason? With a charitable outlook, it doesn't take much to see how a mother of 3 with 3 jobs is doing the best they can, and to get down on them seems petty. I'm part of society, impose some of those costs on me. That's what society is for, at least the small "l" liberal kind of society I'd prefer to live in.

That's of course not to say that there aren't genuinely awful people and parents out there, but often they're not spending every waking hour working to support their kids, with little to nothing remaining after bills are paid.