This is not a football match. Though the way some spectators behave, watching from afar, you could be forgiven for making that mistake. At Wednesday’s game against Atletico Madrid, Celtic supporters defied a Uefa ban on political symbols by flying the Palestinian flag, expressing a long-established solidarity that has become part of the club’s identity. So strong is the allegiance to their chosen side – their team – that at a home game on the afternoon of 7 October, hours after the men of Hamas had begun their massacre of civilians in southern Israel, and while the torture and murder...