JWs are definitely on the 'Christian' spectrum. However, they view Christianity in a different way than the mainstream religions do, and there are reasons why it is this way.
How they contribute to solving the troubles that plague humanity is done at a personal level, one a person at a time so to speak. Let me explain. In my Spanish cong there are several examples of individuals whose lives we lived while drinking in excess, smoking, drugs, and other unwise ways; since becoming JWs, these same people seem to live a better quality, cleaner life. So, rather than distributing food at the KH, the teachings dispensed there are spiritual food that, when put into practice, help the subject to take ownership of behavior and adjust it for a better outcome.
SL