These are your meshulachim, they ain’t local and they are dressed “in town” …
Rav stops them from doing it in the middle. It looks like they have lists of times and rules in shuls. Maybe shared online?
If this is a genuine need, though, I do not think we should stop that. After all, we are supposed to give tzedoka during davening. Does it have to be to a pushka rather than a person?
Sometimes you can see that the person is really in trouble and even why. I saw one guy several times. he is always distracted, running out every 5 minutes talking on the phone. Once, maybe it was an emergency. But many times – I did not see company CEOs getting so many important calls during davening. Maybe this guy was running some multi-level multi-shul scam and coordinating assaults? Would giving a mussar advice be a substitute for tzedokah? I was thinking about arranging with some local business to recommend them to go work there for a day. Would it be offensive to give a business card?