Just because you can't see how you would be able to give a bum a satoshi or two doesn't mean it can't happen.
All the problems and needs that will arise from a Bitcoin or Digital Currency system will be solved by the free market.
If the demand for providing satoshi's to bums is great enough someone will come up with a way for that to happen. I can already tell you there are ways you can do this today easily. As BTC Atms become available and more merchants start accepting BTC this will be much more easier to envision
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