I'm not an absolutist about it, and I'm happy to help people who need the help. However, I think it's reasonable to expect people who are able to pull their own weight.
+ just for the sake of simplicity, hopefully in a real system the fraction I'm supporting is less than one
Edit: Formatting
As far as I understand modern production technologies may need rather humble number of humans to produce amounts of goods enough for much much much more people so the situation when one man work yields enough to feed a thousand is not a fantasy. I actually doubt many people that actually do useful productive work do just the amount to feed themselves even if they are paid just the amount.
And there also is a huge number of obstacles that can prevent people from doing what they are good at or anything useful at all. In many countries and in many areas people still have to compete to get a job even if they are willing to work. A coder can be denied a job for not smiling enough, being bad at solving puzzles or having a degree less fancy than another applicant has. Will to do a job and will (and capability) to compete are very different things.