Here is a value that I have which is counter to ethical altruism: I have a small amount of cash in my pocket, which will (given enough time) purchase junk food

Here is a value that I have which is counter to ethical altruism: I have a small amount of cash in my pocket, which will (given enough time) purchase junk food with. However, I see a random charity donation box so I put my money in that and feel happy that I've done two good things.