> The high conviction rate is a result of extremely high maximum sentences. People who are 100% innocent often plead guilty after being threatened with a 30-year prison sentence that would be only 1 or 2 years under local law.
That's erroneous because very few federal defendants actually face such long sentences, so those that do so pleading guilty is not a plausible explanation for high conviction rates.
Federal sentences for a particular instance of a crime are based on the class of the crime and on the details of the particular instance. The class sets an upper limit, which often is long, up to 20 years, but it is the details that determine how much you can actually get. To actually get anywhere near that 20 years you have to have a lot of the details against you. Typically this means you caused a lot of damages or harm, had multiple prior convictions for similar crimes, where doing it as part of organized crime, and similar things.
Swartz is a good example. A lot of reporting said he faced 30 years or 50 years or similar big numbers. Actually, he was looking at maybe 6 or 7 years if things went as favorably as possible for prosecutors.
The DOJ bears a lot of the blame for that bad reporting. They make no attempt in the press releases announcing indictments to actually compute the maximum sentence for the particular instance of the crime. They just give the maximum that it is possible for the worst possible instance of that crime committed by the worst possible defendant.
Here's a good article on federal sentence length [1].
[1] https://www.popehat.com/2013/02/05/crime-whale-sushi-sentenc...