In "The Crucible" what have the Puritans failed to learn from the persecution of their ancestors?

The Puritans fled to the new continent in order to escape the persecution that they were suffering in regards to how they wanted to practice their religion.  They felt that the Church of England was corrupt, and wanted a more pure and clean religion; they broke off and attempted to form their own church.  They were persecuted; they were treated as heretics, they were the victims of figurative "witchhunts."  They bemoaned the lack of tolerance, acceptance, and rationality shown by those who persecuted them.

Despite the fact that they were the victims of vicious prejudices and irrational fears, despite the fact that they were persecuted and attacked, they did not hesitate to turn and do the same thing to members of their own community.  They hunted people down, called them out, accused them of absurd and illogical claims, and even killed them for these paranoid beliefs.  They themselves did not take their own advice--they did not purify their intents, they did not treat people with respect, kindness and calm rationality.  Unfortunately, the sad instances that occurred in the Salem witch trials showed how human nature is indeed fallible, and subject to the power of greed, hatred, jealousy and envy.   I hope that those thoughts helped a bit; good luck!