what's wrong with doing good if it's purely self-serving? rational self interest good is still good

i agree the world domination is inherently immoral but don't despair - there are many good people in america who work for NGO's and help protect people around the world, or just donate money to charities...their government is screwed up but that can be fixed...i think america would be a different country if it's government accurately reflected the people instead of the special interests