What I find most hideous about every single wrong conviction is that it could not just have prevented most of the time and that it was contrived by overeager prosecutors - for every one wrongfully convicted the real culprit is walking freely!

Just watch "West of Memphis" (http://www.imdb.com/title/tt2130321/) and see how the state solves the issue of three wrongfully convicted boys - with something as rediculous and stupid as the Alford plea (http://en.wikipedia.org/wiki/Alford_plea) - nothing more than a sophistry with the very practical effect of that the police doesn't even have to solve the crime anymore.

I am from Germany and we have a less extreme contemporary example of wrong conviction of Gustl Mollath - he was basically fucked over by a network of Bavarian judges, prosecutors, bankers and expert witnesses for denouncing the HypoVereinsbank of fiscal evasion.