Because we could work on more effective causes with these resources. See Michael’s
The difference probably matters even more in some causes—I would posit that SCI probably does 10,000 to a million times more good than the best arts charity. That means if you can convince one person to give to SCI, that’s as good as convincing 10,000 arts enthusiasts to make donations more effectively within the arts. One of these sounds a lot easier than the other.
Spreading EA thinking within domains is an idea for an intervention in the EA outreach cause. I don’t think the good per unit time invested (=impact) can compete with already existing EA interventions
The former; outreach is great. It would probably be better if you argued in the thread above to collect your thoughts in one place, since I share Ben Todd’s opinion and he put it much better than I could. I enjoyed reading your well thought out post by the way!