I don't know... mostly loonatics and folks with disabilities don't bother me, though I did have one come up to me in my car and punch my car. He screamed something about rich people and new cars, then punched my VERY well used 2006 Ford Fusion with 142,000 miles on it, and put a brand new shiny dent in the door.
I see a bunch of videos online, where some guy comes up behind someone and pays for their groceries. Or some woman whines about not having the money and the folks in a hurry behind her pay for everything just so they can get done with shopping. They aren't uplifting stories to me. I have been helped by strangers a couple times in my life, never for 3 or 4 times the amount of money I actually have, only for a few pennies or a couple $$ when I didn't add it right in my head. And I have turned around and done the same for folks who caught themselves off guard, but certainly not $150 worth. I've let folks use my Kroger card to get discounts (and I could get the fuel points).
I believe in compassion and doing good deeds, but I also don't want to be taken advantage of. I've taken pan handlers and folks who claim to be homeless inside the grocery store and buy groceries for them. And there used to be a guy that sat outside of a Von's store in Riverside with his dog, I would buy him a sandwich and a hunk of meat for his dog every time I saw him. He was really nice. Though he was puzzled by the meat for his dog, I told him my dogs eat meat, and I won't buy poison for anyone else's dog either, so his dog gets meat from me. He laughed and said ok. The store manager ran him off eventually, but he wasn't hurting anyone, nor was he asking for anything.
There was one time I took a lady inside a grocery store (I think that was Von's too) to get food for her kids. All she wanted was sugary and sweet things in sealed packages. She didn't want any fresh fruit or sandwich meat or anything that could be made into a sandwich. And when we left the store she asked me for the receipt, and I said no. I needed it for my records, and it was my money that I spent, not hers. She cussed me out, threatened me.. oh boy. The manager of the store came out and asked about the commotion, I told him what happened and he said he would take care of it. My groceries were already in the car, so I just left, with the receipt in my hand. I don't know if the manager gave her the money back or not, I tried to do a good thing. It still doesn't stop me from helping folks when I can, though I'm a little more wary from the start.