Even changing “do” to “did”, my counter example holds.
Event A: At 1pm I get a cookie and I’m happy. At 10pm, I reflect on my day and am happy for the cookie I ate.
Event (not) A: At 1pm I do not get a cookie. I am not sad, because I did not expect a cookie. At 10pm, I reflect on my day and I’m happy for having eaten so healthy the entire day.
In either case, I end up happy. Not getting a cookie doesn’t make me unhappy. Happiness is not a zero sum game.