On 28 January 2017, I rushed to the San Francisco international airport SFO. Like elsewhere in the US that night, demonstrations were growing against a travel ban Donald Trump had issued against visitors from seven Muslim majority countries. The night was chillier than normal, and I had not brought an adequate jacket. Luckily, the train to the airport was warm, full to the brim with jittery, talkative protesters. The airport itself was a rowdy scene: cabs and Ubers stalled as angry protesters
