In the Crucible there are people getting accused of and punished for something they have no control over. The same thing was happening during the 1950s with racial segregation.

As far as I know, a tragic hero is the main protagonist in a tragedy. They always have some sort of internal struggle or issue to overcome which is part of the storyline. A tragic character has these issues too but is unable to overcome them.

Of course there are parallels to today! People all around the world are being oppressed because of something they can't control similar to what happens in the play.