I'm afraid I'm not clear what the challenge was. The Rambam and Shulchan Aruch define exactly the parameters of tzedaka that a community is required to fulfill (as Hirsch described them). But *individual* Jews can sometimes be required to act in ways that, for a community, would be forbidden and, in fact, a sin. I would suggest that most applications of די מחסורו would be counted in that category.
I'm afraid I'm not clear what the challenge was. The Rambam and Shulchan Aruch define exactly the parameters of tzedaka that a community is required to fulfill (as Hirsch described them). But *individual* Jews can sometimes be required to act in ways that, for a community, would be forbidden and, in fact, a sin. I would suggest that most applications of די מחסורו would be counted in that category.
Or another way of putting it: the community's business is tzedaka, while individual Jews are expected to also engage in chesed.