A quick moral rule of thumb I use:
"What would I expect to do if I found myself in this situation"
The police leadership won't give the order to storm the building. My own kids are trapped in the building. I think I would reasonably break ranks and try to rescue my kids. I'd like to think I'd try and rescue some other kids too, but I may be bullshitting myself there.
Anyway, I don't think the cops who went in for their own kids are evil. Seems very understandable.
How do you reform this?