It is indeed used for the purpose you stated. But it is also used in a country of fundamentally free people who have the power to force it to be used objectively.
Being a free people, however, they also have the power not to force it to be used objectively.
The problem has never been tyranny. It's always been people who choose tyranny over freedom for the promised comforts of indemnification, versus guaranteed difficulties that come with personal responsibility. Ironically the guaranteed difficulties lead to peace and prosperity, while the promised comforts lead to misery and death. That's why evil preys on the spiritually immature so successfully.
I often wonder whether the American system is doomed to fail not because it acknowledges God-given freedom, but because there are simply too few spiritually mature people to value that freedom. Instead, more and more Americans are choosing to use their freedom in order to destroy it, like liberals voting for ever more slavery in the name of what they call peace. That's why Lincoln called it "The Great Experiment."
The Statists control all the law schools. That is the problem, right there.