Serious question: why should I donate for this cause when I can donate for vaccines or famine relief and literally save orders of magnitude more people?
In any case, it's natural to look out first for those in your own community (although admittedly you have to have an extremely broad definition of "community" for that to apply here). Yeah, we could get into philosophical debates about how it would actually be better to save more people by looking outside of your community, but this discussion is strictly academic if we aren't already donating as much as we feasibly can. We shouldn't critique steps in the right direction (helping others more) just because they are imperfect.