Poor little boy 
I don't blame the mother though. It is a terrible choice but if she didn't let them do it she would have been sent to jail. Who knows what would have happened to her son then, if she is a single parent without any kind of support.
Who would be prepared to carry that out on a little 5 year old kid though? Such sickos. I wonder about the time frame as well. How long between the little boy spitting at someone, and them hitting them with that bat.... Would he even be able to connect the 2 things in his little mind, at that age?
I'd be scared to be hit with that bat as an adult, let alone as a 5 year old being hit with a bat by a fully grown adult.
Pour little thing, and such cruel, cold, heartless adults administering it.