Boop, The Crucible is about the Salem witch trials in the 1600's. At the time it was written (late 40's/early 50's) it was also intended to say something about McCarthyism.
As for making a false confession to save your life, that's how the American justice system really works. Only about 5% of all criminal cases go to trial. The rest get plea bargained. The five thugs recently cleared of rape and attempted murder in the Central Park Jogger case fall into that category. Their lawyers told them that a guaranteed deal of 5-7 years was lots better than 20-to-life they might have gotten from a jury, and they bought it.
In this case, no real harm was done. It wasn't as if they'd never been in prison before. It kept 5 lifelong thugs off the street for 5 yrs. They may have been not guilty of this specific crime, but they were hardly innocent. Think of it as punishment for the crimes they didn't get caught doing.
Strelnikov