Financial irresponsibility is probably not the only thing you want to look at here. Concentrations of wealth like this work to hugely distort politics, business, the legal system... It's pervasive.But why exactly should the poorest go up? I agree with what was said a lot in this thread.
If someone can live comfortably if they just cut their beer money or DirecTV then why should income go to them? Why should we give the bottom more money if they have clothes on their backs and food on their stomachs? They have to work to rise up.