As for charity reducing unemployment, I think you are assuming I am talking about simply giving the poor money. There are charities/non-profit organizations that help people find jobs. Many exist already for the government: vocational rehabilitation.
As for "forcing us to pay at all", well, I was thinking both Bob and Dick would have to pay at least SOME tax (military, SS, etc). Dick believes that we should not pay any tax that helps poor and the needy ONLY. So Dick believes that it should be up to the individual if they want to contribute.
I believe the scenario would be very different if it was shown statistically that more money to help the poor and needy does have positive results (not just for them, but for everyone else, too).