How the hell is the Justice System in GoT supposed to work, really? if you think about it, it soon breaks down, due to one simple notion: Trial By Combat.
If every losing party of a court-case can simply declare that they wish to have a Trial By Combat, then Justice simply amounts to whoever is the biggest fellow or has the deepest pockets (to hire the biggest fellow). In fact, the richest guild in Westeros should be the Justice-Guild, which specialize in doing nothing but letting noble-men and women hire their sell-swords to win their court-cases. Furthermore, why would the commons ever tolerate such a system? Yes, a feudalistic system of Justice will forever be corrupt, but there is still a chance of actual victory against one's Lord.
In this system, a Lord can always afford to hire an armor-clan mercenary to fight in his stead, and unless the commoner want to risk his, his son's or neighbors life, fighting without armor and training against a professional, he will have to bow his head in defeat. This applies to all the less wealthy Houses as well, as they would hardly tolerate being pushed around in legal-matters because those with more money could simply buy out every good sellsword in the area.
If every losing party of a court-case can simply declare that they wish to have a Trial By Combat, then Justice simply amounts to whoever is the biggest fellow or has the deepest pockets (to hire the biggest fellow). In fact, the richest guild in Westeros should be the Justice-Guild, which specialize in doing nothing but letting noble-men and women hire their sell-swords to win their court-cases. Furthermore, why would the commons ever tolerate such a system? Yes, a feudalistic system of Justice will forever be corrupt, but there is still a chance of actual victory against one's Lord.
In this system, a Lord can always afford to hire an armor-clan mercenary to fight in his stead, and unless the commoner want to risk his, his son's or neighbors life, fighting without armor and training against a professional, he will have to bow his head in defeat. This applies to all the less wealthy Houses as well, as they would hardly tolerate being pushed around in legal-matters because those with more money could simply buy out every good sellsword in the area.