Question

How does Miller explain the fact that communists exist, but witches never did?

Answer 1

Miller said that the witches were a belief in the mind of people at that time.

they didn't know that it was just a belief it don't exist at all but it was a type of superstitious belief that they might as well have been as real as the Communists of the time. I think by this way Miller explains the fact that communists exist, but witches never did?

Answer 2

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Miller says that in Salem at the time, witches were a real thing in peoples' minds. The people may not have known they existed, but they believed in them to the point that they might as well have been as real as the Communists of the time.