I can understand why it seems that way, but speaking only for myself, I think it's a misunderstanding to say anyone is 'hoping for the worst'.
Bad things happen in this world. And they happen alot to elderly vulnerable people.
The police know this, which is why they are considering all the options and haven't closed the case at the face value of what they found at the scene, but are investigating further.
My desire is that bad people don't get away with doing bad things.
I'm glad that an investigation is being done, in order to rule out the worst possible scenario.
Certainly not because I'm hoping for it.
To be honest, it's hard to know what to 'hope for' in this case, because all the possibilities are horrifying.