if you know a little bit about the process, you know that they try to avoid transferring children directly from birth parents to foster care. everybody understands that this is traumatic. so, you don't want the kids to associate the separation process with the people taking care of them - whether permanently or not.
instead, they get these neutral figures - cops, or people the kids will otherwise not see again - to do the actual separation. they then place them somewhere for a short amount of time, before the foster parents are assigned, and come in and take them out.
the process looks brutal, and it is, but where exactly did you get your degree from, that allows you to second guess all the preparation that was put into this, for the benefit of the child?