It's an utter tragedy.
I'm not sure it's a sign of the times or a sad indictment of society today, but rather society in general. Not because people don't care enough to break down a door, but that there are people in such desperate need in the first place.
I live in a close knit small village, yet I can go weeks and weeks without seeing anyone, or at the very least, successfully ignoring people's knocks.
I'm not sure what the answer would have been for this poor family, perhaps the HV's concern should have been raised, perhaps she could have involved the police, but how many times would she/he been in that situation of being ignored at the door... they have no power of entry. I ignored my HV successfully... would a legal responsibility to answer a HV's knock make things better or would it be punishing the masses for the sake of the few?
I did not get on well with my HV the second time around, she and I had VERY different views, I found her too much opinion and not enough 'duty'.... I requested no more visits, she visited, I was either out of hiding behind the sofa. Surely, that's my right?
Therefore I do not know the answer other than this is an absolutely utterly gutwrenchingly tragic story.