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Given that they're so uncomfortable with the Je Suis Charlie stuff, it's entirely possible that they wanted to piss everyone off so that people would stop putting them on a pedestal.
Re the firing talk - yeah, typical sharp-elbowed middle class wanker turn of phrase. Quick Google turns up a tech journalist of the same name who frequents a Noel Park message board and seems to do a lot of talking head work on TV. Turn of phrase fits the usual talking head MO, I think.
Charlie Hebdo are either massive racist cunts, or are trying to make out that the media are fickle using an ill-advised cartoon which makes them seem like massive racist cunts.
If there's so much ambiguity around their work that no-one knows exactly what they mean, then they're clearly not very good at it.