Myers response sounds more like what one would expect from an emotionally charged fanatic rather than a man of reason.
In a sense, yes. Myers has just heard that the kid who 'borrowed' the wafer has been threatened with death. Myers is beside himself with fury, and vents with the paragraph you quote. You seem to be reading it as if he's trying to be funny... read it again from this perspective and it makes pefect sense. He has my full support.