can't actually believe the naivety I'm reading. This level of emotional unawareness would make for a very poor fostering environment IMO.
You are being incredibly contradictory here.
You've said some foster parents act poorly if they want to be considered to adopt a child they have a foster placement with but they are not considered ..and that their behaviour then affects the foster child.
Which means that some do not. Otherwise you'd have said every parent you've seen acted like that in those circumstances.
Presumably the ones who do not behave like that are the ones who can put their feelings below the best interests of the foster child
Then you accuse someone of naivety for understanding that about those people.
It is also somehow emotionally unaware to recognise that the best interests of the child come first and frame it accordingly.
If I said 'oh I'll be so upset & angry, and I'll show it to the child" . You be ripping me to shreds for that.
If I say "I'd do my utmost to act in the best interests of the child, not selfishly" ....... I'm "emotionally unaware".
I'm nearly 50 years old, I've been through some of the things life throws at you by 50 years old; I'm aware that humans recover from or at least learn to live with grief, pain etc.
That's not emotionally unaware, it's the opposite.