Cause thats because its not bitcoin's  responsibility, it is just a digital currecy to be used for transactions and investments, eradicating poverty must start in everyone of us,it is achoice I think. Since poverty is one of the most unsolved businees of the world  think constant effort must be conducted, charities, public services , educational programs may help giving support for those in need and local and private entities must contribute financial assistance for this vision to be true.