Here's a lens that might be helpful to view this through: seeing these kinds of personal, touching results encourages philanthropy--we're "spending money to make money," so to speak. We just need to channel that generated emotion and desire-to-help through the cold, calculating hands of organizations like GiveWell. :)
Another interpretation could be: "we did out part, we helped batkid. No need to donate/volunteer/etc"
There's a similar thing called in internet activism , where people who upvote/like and comment don't go and be really politically active, in a politically meaningful way.
I wonder whether seeing a story where something good happened that you didn't have a (rationalizable) part in, still triggers the effect. If it did, you'd think aid organizations would A/B-test call-ins to their telethons and realize that they should stop showing the happy kids that've already been helped.
