It's very disturbing to me that there are any qualifiers that could make that statistic acceptable. It's like explaining the FISA court's approval rate.
In the US you can have your cake and eat it too: get shot by cops and have to plead guilty to avoid spending a huge chunk of your life in jail in favor of spending a slightly smaller chunk of your life in jail. America's the greatest country in the world (when it comes to injustice by the numbers).
It's extremely different. That 93% figure is limited to federal criminal cases. The vast majority of offenses are state and local. This same wikipedia article says, "In recent years, the conviction rate has averaged approximately 84% in Texas, 82% in California, 72% in New York, 67% in North Carolina, and 59% in Florida."
So, you're talking anywhere from (roughly) seven times as frequent acquittals to over 40 times as many.
I'd rather deal with cops who might shoot me than cops who will definitely get a confession out of me if they want one.