@ArcturusSaDiablo: Because the rating is based on how much you borrow, keep borrowed, and how well you make payments and pay things off. There's an income-to-debt that is "optimal" for good and services to flow, for minimum profits, and keeping macro-economic wheels greased so that interest rates, consumer confidence, and small and large business payrolls and overhead on an even keel.
@ArcturusSaDiablo: Like the internet always says it does but doesn't usually, the economy self-regulates as well but doesn't usually either. Neither are a closed system, though many treat them as if they believe they are. The Golden Rule has been always and always will be "He who has the gold makes the rules", and more broadly but specifically, it whomever holds the power. Democratic stuff only works when enough people agree. Hence, crap.
@thedisasterautist
And thus, crap.