I always carry spare inner tubes, usually at least 2. Several times I have stopped off seeing someone at the side of the road. My credo is to provide an inner tube to the person I am helping with condition that they pass the favour along. I have no idea whether that person will give that any thought, or not. Not my problem.
Many years ago a friend of mine met another guy out on the road. They were both riding tubulars and my friend gave this guy his (patched) spare. A few days later this guy showed up at my friend's place with a brand new replacement
Sometimes a good deed reaps benefits
Years later, I ran into that same guy, and his version of the story was the same