Battered toddler die in horrible way........

I read online newspaper, and came across an article that read toddler battered to death by mum's live-in boyfriend and tenant. The most ridiculous is that social workers fail to notice the injuries despite over 60 times of visit.
I was astonished to read it, and sad at the same time. My deep-felt symapathy go to the boy. So young only 17 months, and a long way to go, yet he's dead. My tear was welling up, but I controlled.
The article state that the mother constantly neglect the child welfare, putting him in cot unattended for hours, while she surfed the internet for pornography. Later when her boyfriend move in, he started abusing the toddler, named Baby P. He treated Baby P like punching bag, not one of his cloth was unstained with blood. He did many abusive thing to Baby P, and he was treated worse than animals. I just couldn't bear to describe the "treatment" endowed on the poor toddler.
One already bad enough, imagine another guy (tenant) move in also same treatment. What amazing is how come the social worker never spot all this injuries, even though the mum has excuses for all his bruises but isn't that abit too far stretched to accept. No matter how active a child, but there can't be so bruises, and it's all over the body.
In the first place, they shouldn't has returned the boy to his mother, after they found the mother to neglect and abusive. When the judge found them all guilty, they aren't guilty or remorseful. It's simply inhumane.
A life is gone just like that, and he's so defendless and vulnerable. A life that has just begun, yet ended so shortly. More thing need to be done to protect children from subjecting to abuse. They deserve the right to grow in a loving and healthy environment. It's also the parents' responsibility to ensure their well-being, physically and emotionally.