Why is EVERY tzdekah deserving of my money. Just because someone has a tzedakah doesnt mean I have to give to them.
For example what if you are a Satmar and you get a Call from someone collecting for the Medina, Are you supposed to give?
BTW Not all money given to tzdekahs goes to the tzadekah, I know someone who worked for a Call center and they got paid a percentage of how much they collected from the phone calls for tzdekah money