What is to be realized is that we can't blame others, and we can't blame the system, as all of it is simply outflows of how we've accepted and allowed ourselves to exist. And it's fascinating, that in this situation, the behavior which the mother acted out, of disciplining her child for not living 'correctly', is then what she immediately faced within her environment, but instead done towards her; because the government stepped in, as the 'authority' and told the mother what the 'correct' type of living is, just as she had done towards her child.
So the mother isn't innocent in all of this, she in-fact lived from the same starting from which the goverment did, which is that of the 'authority' and 'the parent'; wherein one do not consider and treat others as equals, but instead superimpose once rules, regulations and opinions upon others through coercion and force. This is how the family system functions, and this is how the governmental system functions, as the reflection of the family system on a bigger scale.
And what is it that both the family and the government system fail to see?
EQUALITY, and give to another as you'd like to receive.
Because, obviously the child didn't want to be spanked; yet it became spanked 'for the greater good'. Instead of time being taken to share the common sense point of not running in the bus, wherein the mother would then stand one and equal to her child, and share herself without considering the point of enforcing her will, without regard or consideration – but in-fact supporting the child to become self-responsible, and grow, become a more whole human being.
And when the child was taken from the mother, obviously the mother didn't want to loose her child, but she did, and from the governments perspective it was 'for the greater good'; but was the mother in-fact treated as an equal by the government? Was she supported to see that such physical punishment isn't acceptable, told why, and then supported to correct herself? Or was time taken to understand the context in which the women acted? Maybe she was stressed, maybe she was fearful of what the other passengers would think of her child running around in the bus?; no, none of these points were considered, because the government act from the starting point of superiority, as 'I am GOD' and I will excert my power unto you. Not acting from a starting point of looking at a situation from anothers view, placing yourself in the shoes of another, and in-fact considering what is best for all; instead of only acting by force, to apperently make things become "right" through punishing another, as if that will have them understand you more effectively; it'll only make them spiteful and afraid.
So, we can't blame the system, or the man that involved child services –- because this type of behavior as us believing ourselves to be superior, and god's, apperently holding the right to superimpose our ideas upon reality exist within everyone, and everywhere. As such, in order to change this we must begin with ourselves, and see how we are living out this pattern of 'I am god', 'I am authority and I have the RIGHT and the FREEDOM' to do what is 'required' to be done, not considering the harm we're in-fact doing towards others, and ourselves.
So that's basically the lesson that can be learned from the situation that was described, that if each participant had acted with consideration and care towards each-other, as what would in-fact be the best for another; everyone would have walked away from the moment as stronger human beings.