Augustus
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Considering the church turned witches over to secular authorities, trying to say the Church isn't responsible is like trying to say Hitler wasn't actually responsible for Holocaust or the slaughtering of millions because he turned it over to someone else.
Also, it wasn't only witches who were being burned.
Whole sects were deemed heretical by the church (Cathars, etc) basically greenlighting killing their members. The church often didn't carry out the punishments themselves as burning people alive probably wasn't what Jesus would do. So they left it to the other courts.