One gauge of a society’s level of interpersonal trust lies in how much the central government shares power – with local authorities, courts, private citizen groups, and others. For the last 16 years in Hungary, such trust has been evaporating. An increasingly authoritarian leader, Viktor Orbán, had been centralizing power and creating “us versus them” polarization around often-fabricated issues. On Saturday, all that changed with the swearing-in of a new prime minister, Péter Magyar. His broad-tent Tisza party won big in elections a month ago. In his inaugural speech, Mr. Magyar pledged not to rule over Hungary but to “serve” it – through reconciliation, inclusiveness, and democratic renewal. “We are going to remake the constitutional system so that such a concentration of power can never happen again,” he declared. Mr. Magyar also apologized to people who had been marginalized and maligned by the state during Mr. Orbán’s long tenure.…