Great bit of video and the commentary says it all

From John Hinderaker writing at Powerline:

THE SANE VS. THE INSANE
Via Ann Althouse, check out this confrontation between a young woman who is a BLM activist and an older African-American man. They are standing in front of, and arguing about, the Emancipation Statue that freedmen paid for and where Frederick Douglass spoke. You don’t have to understand the words the young woman is screaming to know that you are witnessing a dialogue between a normal person and one with serious mental or emotional problems:

We see this all the time with the protesters. All the time. Shrill yelling with zero attempt at holding a discussion. Their agenda, all the time.

The poster child for this mental illness is, of course, triggly puff:

Behavior so aberrant that it is worth an entry in DSM. This entry from October 2015 is satire but it is so close to the mark as to be real enough:

DSM-IV 301.95 Progressive Personality Disorder
Nails it - from John Moore:

DSM-IV 301.95 Progressive Personality Disorder
A. A pervasive pattern of progressive political and inter-personal thought and action, rooted in discredited leftist (neo-Marxist) beliefs, beginning in early adulthood and present in a variety of contexts, as indicated by at least five of the following (individual must be at least 18 years of age to qualify for the diagnosis of Progressive Personality Disorder, as many of the criteria are age-appropriate for adolescents). This disorder often coexists with Narcissistic Personality Disorder.

1. 1. 1. Utopian thinking, e.g. a delusional belief that there exist simple, linear, side effect-free solutions to all social problems.
      2. Lack of historical knowledge and perspective, and repression of personal memories dissonant with this belief system. e.g., the national mood post 9-11, including that of PPD patients, is suppressed in order to avoid conflict with subsequent reversal of beliefs as the PPD delusions were reinstated - hence the downplaying of terrorism as a threat and the obsessive concern for the "rghts" of temporarily feared and hated terrorists. (Note to clinician: please differentiate between mere historical ignorance, e.g., a doctorate in history from an elite university, vs. neurotic or psychotic delusions necessary to sustain these beliefs. )
      3. Anthroplastic delusion, e.g. The delusion that behavioral conditioning performed by the government or some other collective will cure all behavioral and social problems, rooted in denial of fixed human nature. Implicit in this delusion is the idea that human beings are infinitely malleable and subject to behavioral manipulation leading to perfect control and predictability. Free will, personal conscience, and objective morality are denied, devalued or denigrated.

Much more at the site - this nails it perfectly.