Calgary writer Mark Milke yesterday penned a moving critique of tourists at Dachau who take happy selfies against the macabre but iconic architecture of Nazi mass murder. Alas, the passage of time does seem to attenuate our capacity for outrage and empathy. Compare people's visceral reaction to revelations of Iraqi torture last week with the campy descriptions of torture used to pitch the Tower of London. Social media may well turbocharge the shallow ego-centrism of our selfie culture. But in the hands of controversial artists like Shahak Shapira, they also promulgate the antidotes.