And as so many have stated, You would be the first in line to blame them had some jackass abducted your child. You would be there screaming that they didn't do enough to protect your child.
Sorry, you are dead wrong here.
I suspect you are more angry that there was a scene, and that people thought your child did something wrong. Nope. It was you. You left your 8 year old child unattended. Perhaps you would have preferred them havng a sign stating they would call the police for parents who left their minor children unattended?
They simply brought your child to what they believe was safety.