Presumed Guilty

After a few years of analyzing and writing about politics, Alu discovered that the civics lessons we all learned as children are very far from the reality of our world. Though we all learned that Americans are 'presumed innocent until proven guilty' and convicted by a jury in a court, that is not how it works. When cops approach you, they determine that you are guilty, and they punish you before you could blink, let alone talk about the natural right to due process or the Constitution. From traffic law to self-defense, it seems like we are often punished before being convicted in court. Is there one common root cause for all of the violations of due process? What could we do to restore justice? Or is it a lost cause?