This seems less like a case the "oh, the PC Police want to do away with political humor!" and more just shifting tides in media - i.e. that the conventional new

This seems less like a case the "oh, the PC Police want to do away with political humor!" and more just shifting tides in media - i.e. that the conventional newspaper political cartoon is a form trending towards obsolescence. Political comedy is very much alive, at least in terms of its popularity and range across the political spectrum, attracting from the far left (e.g. Chapo Trap House) to liberals (e.g. most late night hosts) to all your various forms of conservatives (e.g. Crowder). To me the "political cartoon" as we once knew it seems like a dated formula, one that might be argued has already been replaced by the format of internet memes which can serve similar political function. (Also personally I have never really cared for political cartoons, they've always seemed unfunny and too reductionist. Although I suppose the Stan Kelly Cartoons from The Onion might be an exception.)