Pope Francis has summoned senior bishops from around the world for the first global gathering of Roman Catholic leaders to address the crisis of clerical pedophilia. The action is long overdue. The latest barrage of revelations and developments - including a gut-wrenching report by a grand jury in Pennsylvania detailing seven decades of sexual abuse of at least 1,000 children, and probably thousands more, by more than 300 Catholic priests - has left no question that Pope Francis' legacy will be decided by how he confronts this crisis. To be meaningful, any further response must include openly addressing allegations that the pope was himself party to a cover-up. The president of the United States Conference of Catholic Bishops, Cardinal Daniel DiNardo, met with the pope on Thursday to demand a full investigation into how the former archbishop of Washington, Theodore McCarrick, rose to high rank despite a long and apparently well-known history of sexual predation. The crisis has been further complicated by a scathing public letter from a former Vatican envoy to the United States, Archbishop Carlo Maria Vigan, accusing Francis of lifting sanctions against Cardinal McCarrick. The Vigan letter, the culture wars it reveals within the church, the McCarrick affair and even the Pennsylvania grand jury report must not deflect attention from the core of the crisis. This is a pattern of widespread and gross violations ... and of cover-ups stretching [to every corner of] the world.