> Our fiduciary obligation is to give 10 dollars to each of 1000 meshulachim, not to gave 10,000 to one.
you are fiduciary for the money of the poor. this basic approach diversifies so that you don’t give to one ganav and also keeps shalom between many. Still, would you do it with your own money – spending $10 on different pursuits or do you invest your money/time in a smaller number of carefully selected projects? So, if you happen to know worthy causes, makes sense to focus mroe on them.
One word of caution: if you give $10 to everyone knocking on hyour door, do NOT give $100 to some of them. A friend gave one guy more than usual, and within a month multiple people showed up, asking for the higher amount. Apparently, not due to inflation, but via shared marketing lists between the meshulachim.