Our moral intuitions are developed for dealing with actual cases that we are actually experiencing. If you showed up with a fire hose and found that a bus full

Our moral intuitions are developed for dealing with actual cases that we are actually experiencing. If you showed up with a fire hose and found that a bus full of X people and an empty community theater were on fire - it would not even occur to you to save the theater. You would save the screaming people who are begging for help. One way to think about effective altruism is that it's trying to get you to apply whatever moral intuitions you would use in a concrete scenario to an abstract scenario. To any individual apart from it, it's abstract to know that mothers in some poor country can't adequately nourish their children, or that mosquito nets reduce malaria deaths, and so on. But, the reality is that those people are actually real, are actually suffering, and actually could be helped. If you take that message to heart then it won't make sense to send your charity to the community theater - by all means, send the theater money if you want, but it's a selfish thing, not an altruistic thing.