Why shouldn't they only support one particular international location in the world? Because there are many others out there that need help as well.
8 of the top 10 poorest countries in the world are in Africa, so perhaps they are simply going where the need is greatest.
I'd prefer they helped Mexico. That would have a greater direct impact on the USA.
A lot of them, McCoy included, do a lot of charity work in the USA. Is that direct enough an impact for ya?