I didn't take the "accident waiting to happen" comments as meaning they deserved to die tbh. I think what they came down to is the fact that if you put a family up for public scrutiny like that then sadly there are going to be people who react like that and enact their own sort of justice iyswim.
The family had apparently been victims of a hate campaign since they appeared on that tv programme (I didn't watch it at the time).
So perhaps we need to ask the questions as to how appropriate it is that we put people up on a public platform like this, and the potential consequences of doing so.