Disillusioned with liberal democracy, Carrillo adhered to the locally rising fascist nationalist thought and complemented his scientific research with evolving political ideas and cultural education. He enjoyed friendships with numerous leading names in Argentine tango culture and the new nationalist ideas, including poet and songwriter Homero Manzi (an erstwhile elementary school friend), as well as nationalist activists Arturo Jauretche and Raúl Scalabrini Ortiz, and tango and theater composers Armando Discépolo y Enrique Santos Discépolo. He also maintained close academic links with prominent German Argentine neurobiologists such as his former professor Christfried Jakob and two leading figures in Argentine neuropsychiatric science, Drs. José Borda and Braulio Moyano.