How is John Proctor a voice of reason in The Crucible by Arthur Miller, in Act 1?

Proctor knows what's going on. If you carefully read
Miller's diversions from his own play, he takes time to narrate the storyline behind the
story, which is a land fight between neighbors. Proctor is described in his narrative as
a man who is conscious of his own sin, but as with most Puritans dealt with the
difficulty of having to be perfect. There seemed to be little acknowledgment of the
parts of the bible that identify grace as a piece of Christian
doctrine.

As time goes on, we learn his great sin was an
affair with Abigail, but even as she tries to rekindle their romance, John remains
faithful to the idea that he wants to respect his wife and make their marriage work by
ensuring a clean break with Abigail.

Rebecca Nurse calls it
like she sees it as a mother and grandmother several times over, she says Betty is
faking. Proctor agrees.

After the Putnams convince Parris
of witchcraft, John's reasonable voice notes:

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Then let you come out and call them wrong. Did
you consult the wardens before you called this minister to look for
devils?

Proctor is pointing
out that no one called the cops first to scare the girls out of this act, the adults
present are just believing it to be witchcraft.

Proctor
stands his ground throughout the Act and maintains his stance that the girls are
faking.