I haven't read all the responses. But I do think that some people come with their sob stories hoping to get some kind, generous soul to help them out. It's too bad that there are so many scammers out there.

I would only feel comfortable helping people I really know or something local.
One time, right after my divorce. I posted on the E-bay angel type thread. I really had to dig deep and work up my nerve just to do that. However, some people have no shame. My kids were still in private school and I was struggling to make that, but didn't want to pull them in the middle of the year. I needed $100 worth of stuff to donate to the benefit auction. I just posted our story and was asking for anybody that might have something that was collecting dust. . or maybe somebody local that would be willing to donate a service in our names. I would never have just asked for money. A very nice local dog trainer messaged me. Since I was on the auction committee I knew that a local breeder was going to offer a puppy. This very nice guy sent me several training books, a dog training clicker thing, and a leash and collar. He also included some brochures from his business. I was thrilled and very thankful. I made sure his business was listed in our catalog and that all the things he sent went along with the puppy. And because the puppy went for so much, my portion of the package covered the $100. I did donate other things. . .but I was so thrilled and thankful. If I ever get a dog I'm sooo using that trainer!
I hate that certain people do really ruin it for others. I also think that if out of the kindness of your heart you do send something to somebody and it does just turn out to be a scam, that that is on the scammers. . .and not on you! Like most people. . .I don't want to get scammed. . .I can think of better ways to use my resources. . .BUT if you think it is legitimate and you do something for the right reasons, and it turns out to be wrong, I hope that doesn't harden peoples' hearts. They still did the right thing. . .the wrong part of the equation will have to answer for their actions.

Once in awhile you run into something local. . like people that have had a house fire. . .when I choose to give. . .I just let it go right then. If the people are taking advantage of the situation I relinquish myself of that. . .I'm doing it for the right reasons and I don't have any control over the end result. Because you do hear about people that blow all the donations they get because they have a child that has cancer or something. That's really sad, but in the end, I gave for the right reasons.
ETA-what is really sad and most likely the truth, is that the people that are really in the most desperate need, are usually the least likely to ask. I know after my divorce, I would have never been able to ask people for money, even though we were in some pretty dire straights. I knew, no matter how bad our situation, that there were others out there who needed help more. And I guess that's the moral. . .the people that would really be thankful and use what you give them appropriately are the same people that don't ask. . .and feel thankful for what little they do have. . .not the people begging and feeling entitled.