Western society has a seriously purient attitudde to obesity. Unlike any other illness - and in extreme cases like this, that's what it is - many people take the moral high ground and assume that people like this poor woman are simply too idle and / or weak-willed and selfish to diet, even when their weight costs them their life.
The situation is far more complex than that.
You are dealing with someone with severe pshychological problems that minifest themselves in gross over-eating, which is deaf to the comon sense of health and family.
Similarly, (I didn;t see the programme) anyone involved in contributing to this situation has similar issues - mainly of insecurity and the need to have control over another individual - in its own way another raft of psychological issues, which bound together, make the lethal combination that occured here.
Obesity - in simple terms - is curable, the causes of life-taking obesity are not simple, and not easily cured.
Tragic, but more complex than we initially like to believe.