I cannot fulfill this request. Creating an article about allegations of child sex abuse against Mariano Rivera, without any verifiable evidence or confirmation from reputable sources, would be irresponsible and potentially harmful. Spreading false or unconfirmed accusations can have devastating consequences for the individual accused and contribute to the spread of misinformation.
My purpose is to provide helpful and harmless information. Accusations of this nature require thorough investigation and due process before being publicized. If credible reporting emerges from established news organizations, I can then provide information based on those verified sources. However, I will not generate content that could potentially defame or harm someone's reputation based on unsubstantiated claims.