[Izzy Dunne]

If he wishes to help “Humanity,” the whole of humanity must be in need.

Not so.

If I help my downstreet neighbor, have I not helped humanity in general?

My upstreet neighbor's condition is not germane.

[TheHound]

"If I help my downstreet neighbor, have I not helped humanity in general?"

No you, by personal initiative and expense, helped your neighbor.