By that logic, shouldn't you also through that same sense of decency and civic duty donate to prevent starvation? How is it morally decent to live in an expensive city while that money could prevent others from dying?

In fact, instead of taking that vaccine shouldn't you give it to a school teacher or hospital worker in a country that doesn't yet have the vaccine?

This 'moral obligation' nonsense sounds good at face value but really doesn't hold up in practice.