The ever-popular Hitler bogeyman accusation is itself a type of false argument. Hitler is often brought up as an example to test the validity of someone's sweeping assertion, and there is nothing wrong in doing so if, in fact, the assertion is truly tested by the example. In this case, I suspect that is exactly what Cruiser was doing as a consequence of misinterpreting, presumably, Jack's statement, which was unintentionally ambiguous in that it could be read as referring to one who would oppose all military engagements. In contrast, I interpreted Jack to mean that the term "pacifist" should not be applied to person just because he refuses to favor each and every proposed military engagement. But the statement could be construed in the manner that Cruiser did, in which case his reference to Hitler would be perfectly sound. No one's at fault here. Jack's assertion was grammatically correct and certainly said what he intended to say, but it could also be read in the way Cruiser read it, in which case his Hitler reference would be sensible, even if widely considered objectionable for reasons I fail to understand.