The visual poet and the graffiti artist never expected to set off a global phenomenon and then a furious backlash. Nitzan Mintz and her partner, Dede Bandaid, launched the now ubiquitous red and white posters of Israelis abducted by Hamas – each one with a photograph and the age of the disappeared under the banner “KIDNAPPED” – a couple of days after the 7 October attack in an attempt to ensure that the 200-plus hostages were not forgotten in the looming war in Gaza. But after posting a few hundred flyers around New York, the couple was taken aback at...