It isn't 100% of the time. In my younger and more naive years I had a guy approach me asking for food or money for food, I forget which. I took him to the Safeway I was already headed to to grab lunch myself and had him just fill up a container from the buffet line and paid for it alongside mine. I don't think he was over the moon appreciative but he seemed incredulous that he could just fill it up with as much as he wanted and that I was going to pay for it for him, like he was almost afraid that overfilling it would be rude.