You have to bear in mind the utter crap that the press sometimes write, I think, when considering some of the information we have been given. They do like to sensationalise issues. This morning the BBC described Handsworth as a "close-knit" community. I used to work in Handsworth and the population has always been described as transient - ie, people move on. It is a very poor area indeed with a lot of housing owned by Housing Associations. I wouldn't in anyway describe it as close knit - that is just media spin. ie, trying to say that everyone in Handsworth knew about it, so why didn't the social services, imho.
Also, the post mortem was reported as being inconclusive, so the starvation is still just a theory. However, there presumably is evidence of severe neglect.
I have no idea, since I know nothing about the case, but the parents may have had a mental illness which prevented them from being able to care for their children.
There are some awful things that happen behind closed doors and I feel that the social services are going to be blamed for this. I don't work in social services, but if you are responsible for a city as large and diverse as Birmingham, I should imagine it is a bit of a nightmare.
Of course, I too am merely speculating!!