The implicit message here is indigenous people are non-human animals.https://twitter.com/globeandmail/status/864800202351312896 …
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Nope, Maus is very explicitly a critique of how anthropomorphic metaphors carry racist messages. This cartoon is unthinking example of that.
In other words, animal metaphors are OK only as long as you agree with the message, in which case why focus on the metaphor at all?
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