Love this.

A thing I don't think it mentioned, but that I believe with all my heart is true, is that there's a massive amount of people who will be transformed by you in the course of your interaction. Regardless of who they "really" are at the start, if you are kind and generous, they will become better. If you're angry and hostile, they will become worse.

So your generous behavior maybe will produce a better outcome with Alice, and that would be good; but even if not, there's something you yourself gain when you act in an expansive way; and that you lose when you act small, even if acting small is warranted by the other person's behavior.