ALMOST TWO MONTHS before bemused observations accompanied dire warnings about the ’15-minute city’ on social media, Gemma O’Doherty was among the few people in Ireland who openly railed against the concept. “Marxist Dublin councils are planning to lock you down on a permanent basis through their #15minutecity prison system,” the anti-lockdown campaigner and former newspaper journalist claimed on Twitter in early January. “Tell everyone you know about this and how these criminals want to control your every move.” In the weeks since, conspiracy theories about the ’15-minute city’ – a trendy but bland urban planning concept – have snowballed in...