One way in which the Reverends Parris and Hale are similar is that, however ill-intentioned the one and well-intentioned the other, they both fail the people of Salem. Reverend Parris is more worried about his own reputation than he is about his daughter's health or the well-being of his congregation; he jumps on the witchcraft bandwagon because, if he gets ahead of it, it cannot run over him (so to speak). He isn't interested in truth. He's interested in power.
Reverend Hale is interested in the truth, but his unwillingness to stand up for people and risk pitting himself against the court rules until Act 3, when it is too little, too late. He seems a bit misguided, so sure of himself, his books, and his experience, that he cannot see that others might have ulterior motives. Then, in the end, he counsels people to give up their integrity in order to save their lives, though none of them do.
One minister lies and the other advises others to lie; though Parris is far worse than Hale, the result of their failures is the same: the deaths of innocent people.