Nitpick: The Boston area was basically settled by the Christian Taliban (they were kicked out of England for being too fundamentalist) so when it comes to human rights and treating people with dignity they were behind the times (to put it charitably). The witch trails of the 1690s are roughly analogous to the local warlord having a few minor criminals shot in order to send the message that everyone needs to get their shit together and quit fighting among themselves. You saw that kind of stuff a lot in the middle ages where some lord might have a family cut down without due process because they had some grievance and refused to pay tax/tribute. The Salem witch trials only made it into the history books because the rest of the world had long since moved on from that sort of thing.
Obviously that sort of stuff isn't compatible with modern values but that's just how society (in the Boston area at least) worked back then.