It's a very linear view of situation to assume that 'niceness' will always trump other tones of communication (although a mismatch in tone and action is even more counterproductive).
Yes we are. Negative feedback can be used to curtail such aberrant behavior.
In the hypothetical where Assanti's mental illness is the primary cause of his condition, what allowed that illness to go inadequately challenged? (At this point Assanti is more likely to drag people into 'dark' hole with him. I'm sure that adjective is purely coincidental on your part, right?)
Their willingness to give him a continuing supply of helpings is not rooted in a lack of empathy. They do care about him on some level, even if ignorance confounds their intentions. A non-empathetic, self-serving person would rarely have such intentions.
Maybe someone should find out what it takes to support 4/5 bodies-in-one. Until that figure comes in, we can at least assume that the lower life expectancy is a cost. Additionally, you called all of us creatures in this post, which is relatively amusing.
Edit:
There seems to be an indication of expense here, Synsensa.
Or perhaps an inefficient use of hospital facilities?
The sort of help he wants involves ordering people to feed him. He may not particularly want those other forms of help, but I surmise he's willing to take advantage of attitudes that lead to latter to meet the prerogative of the former.