The gentleman in this video holds that life would be boring if we all held the same viewpoint.
There is truth in this observation.
However, as Dr. Martin Luther King Jr. said following the assassination of Malcolm X, we have not yet learned to disagree without becoming violently disagreeable.
There are some people who are so hell-bent on having others adhere to their viewpoint that they will do anything to insure that this happens. The results can range from disagreeable to deadly when reason is removed from discourse.