I don't know the exact source, but there is a saying that one who saves one
life, it's as if he saved the whole nation.
It seems to me, that if these people are really troubled then this could be a
potential saving of a life. Even if not physically, the reprecusions of your
listening to these peoples problems, are unbelievable. They will be happier
people in general be"h, and that could effect unimaginable numbers.
On the other spectrum, if by training in this computer class will help
provide a livelihood to those that need it, that can also potentially have a
major lasting effect.