Because of the events of last weekend, a lot people online have been saying that the biggest thing we need is a commitment to kindness. Those people have tended to get the piss taken out of them. Partly because logging onto Twitter to say ‘Be kind, guys!’ and collecting the likes feels like a pretty ineffective way to change the world, and partly because as soon #BeKind became a popular hashtag it was destined to look as disposable and faddish as all of Twitter’s brief obsessions do. But also...