What if you see your preacher getting out of his fancy car, and go with a woman who isn't his wife?
Would you stop giving to religious organizations in general, or just not give any of your money to him anymore?
Ditto for animal rescue groups. If you found out a group you were giving to was giving sub standard care to the animals, and using it themselves, would you stop giving to rescue groups totally, or just stop giving to that group?
"Some guy" tells you not to waste your money, "these people" will just buy alcohol, cigarettes and drugs. In addition, they will sell the used clothes, shoes and cup 'o noodles you give them for the same. So you listen to "some guy" who might be a blithering idiot rather than learn for yourself?
I'm wary of those that seem to know what an entire group of people are like.