Support or not, those babies have the same genes that lead to baby kiling as their parents; if it’s not this generation, then it will be the next one. Stuff like this, proves those whole lineages are not the fittest to survive.
Edit: hopefully clarifying.
Support or not, from a Darwinian point of view, those babies are likely to inherit the same cultural biases and genes conductive to acquiring the same cultural biases as their parents; if left to their own resources, then it likely won’t take many more generations until they fail to guarantee the survival of their descendants’ descendants, which the whole “survival of the fittest” is really about.
Stuff like this, proves those whole lineages might require external intervention to make them viable… which leads to a whole other can of worms about cultural interventionism.