Well said.  The notion of  "mental illness" is far too easy a label to abuse and over-use by the unqualified.  Concepts of "mental illness" vary by culture, religion and socioeconomic class among other factors.   Citing your example, a ruthless "winner" with no compassion for others is typically a psychopath.  There have been major examples in history e.g. Hitler, Stalin, Mao to mention a few.  Some believe a  President with a similar mindset currently occupies the White House.  It is a certainty that a psychopath currently rules North Korea.  

Commonly held definitions of mental health v. mental illness are questionable at best with few exceptions.  We can help matters by exercising caution when using a label like "mental illness" to explain what may simply be a difference of views.