SÃO PAULO, Brazil — SINCE early June, protests that began out of anger over public transit fare increases have spread across Brazil, filling the streets of São Paulo, Rio de Janeiro and dozens of other cities with hundreds of thousands of demonstrators. On June 13, the police cracked down violently and the protests mushroomed. Finally, after seven days, the government of President Dilma Rousseff pushed governors and mayors to cancel the fare increases they had presented as the inevitable price of a modern market economy.