What's the phrase? "One man's modus ponens is another man's modus tollens."
Yes, I do think it's an obvious logical implication of the above that if you want to donate to where it will have the largest impact on welfare, you should be donating to Africa instead of the US. As a result, I live in the US and do donate to effective aid organizations that aim to help people in extreme poverty, who are usually in Africa. I don't think there's anything very obviously wrong with this.
Yes, I do think it's an obvious logical implication of the above that if you want to donate to where it will have the largest impact on welfare, you should be donating to Africa instead of the US. As a result, I live in the US and do donate to effective aid organizations that aim to help people in extreme poverty, who are usually in Africa. I don't think there's anything very obviously wrong with this.
I wrote a bit more about my approach to charity here: http://blog.printf.net/articles/2012/11/27/celebrating-seven...