Obviously, the outrage was mainly about the selfie aspect. As I mentioned earlier, the face of the image maker would cover many more pixels than the entire accident scene with multiple people. Not a very appealing composition.
So the prejudice is against taking selfies. Anyway, it must be difficult to take a selfie with an appealing composition, given the 28mm -eq focal, inherent angle of view, and distance to self.
Others have criticized the selfie guy for not helping the injured, instead of taking the selfie, but then there was nothing he could do as help was already there. In this regard, I could criticize the photog for taking a pic instead of helping too.