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xkcd #2932: Driving PSA
(imgs.xkcd.com)
Alt text:
This PSA brought to you by several would-be assassins who tried to wave me in front of speeding cars in the last month and who will have to try harder next time.
Had guy asking me to turn like that and when I refused he gave me the finger as he finally drove on. How come they hold up traffic and then get mad at you for not driving into on coming traffic?
It reveals how they weren't actually being polite. They were doing it for themselves, not you, and you denied them their "good deed" dopamine.
You're right of course, but in a broader sense there is literally no action that anyone takes that is altruistic. We only do things that benefit us or, rarely, our group as a whole.