To be fair to them, they are not all like that. My mother in law used to spend a lot of time simply helping an old lady near where she used to live. When my mother in law died the lady was heart broken and said she had never known such a fine christian lady. Incidently there was no preaching involved.
So the moral is that there are good and bad among the witnesses just like anybody else.
The point you made was valid though. Certainly an elder should go out of his way to help, but as I say there are good and bad.