He would be considered monstrous rather his creation because he went against the social norms for that time period and tampered with life and death. By bringing life to something that shouldn't be alive, it is seen as an evil act or the conjuring dark magic. The unknown is a delicate subject that will cause the most innocent people to turn against those among their communities.
He was arrested because he won't reveal the witness that claims to have heard Thomas Putnam admitting that he was accusing his neighbors of witchcraft so that he could swoop in and buy their land.