Orsino is not able to act as a worthy city leader unless he gets rid of this complex of feelings, as his love, similarly to the mental illness, weakens his reasoning and does not allow him to concentrate and fill his life with social interactions, entertainment as well as work. Orsino spends days dreaming and dictating messages to be conveyed to Olivia, so from the position of a sober and rational person these actions can be attributed to a psychologically disturbed person.