They were not “their own biological children”.
This was a child that was steeped in drugs and alcohol before he was born. There are plenty of other children with same or greater needs, no need to go there first. Going there first is virtue signalling that has detrimental effects on schools that get shoot up.
By contrast, knowingly adopting a child with special needs and caring for that child, is virtue, itself.
"Virtue-signaling is putting a COEXIST bumper sticker on your car, or, setting up on your front lawn a rainbow-flag-background sign that says in English, Spanish, and Arabic, "No matter who you are or where you're from, we're glad you're our neighbor."
Virtue-signaling is speaking-out on something that's already widely popular and solidly respectable in your particular circle. It's a form of cheap grace, unearned merit, un-paid-for moral credit.
In contrast to this, adoptive parents don't just speak out, they live it out. They live it daily and pay up personally.
That's not virtue-signaling. That's virtue.