BB, and I mean this without disrespect, you either have not lived very long or led a sheltered life from the not-so-pretty-side of the world. You do not want to get in the cross-hairs of people with the power of the government behind them. Our system is fairly good; in fact compared to the rest of the world, our Bill of Rights is Second to none. But injustice still happens. Prosecutors, bureaucrats can decide to take a dislike to you and make your life a living hell and break you financially.
The criminal justice system is not much more than an industry currently designed to "manage" the problem: not let it get too big, but essentially "farm" a segment of the population so they have plenty to harvest.
Again, I have not meant this in any way to demean or belittle you, but I think your statement indicates a certain level of naivety.