Well Bubba has no more right to a good life than Liu Chu but if you live next door to Bubba and 7000 miles from Liu Chu I think you have a higher duty to him than her.
Second, you could consider that Bubba has the ability to vote in US elections and Liu Chu doesn't. Making Liu Chu better off is a nice moral deed, making Bubba better off is not just a nice moral deed but also a political obligation.