The bit I really don't get is how that family could have been allowed to adopt several more children after it seems concerns had already been raised. Seems very lax.
US restrictions don't seem to be very tight. I remember reading about an awful British couple who went to American to adopt a women's twin babies because they said it was much easier than trying to adopt here.
Trump recently praised a policeman for adopting the baby of a homeless heroin addict. The heroin addict herself seemed to feel she was forced into it.
And this year I read a case about a woman who was accused of trying to kill her children. I think she may have succeeded in killing one. Anyway, the attorney who was prosecuting her adopted her surviving children...
Personally I am more comfortable with "too tough" rules than too lenient and potentially emotion based rules.