Insightful read. This exposition into arrogance here breaks down the complex relationship it has with self-confidence. Many people confuse and or confound the two by layering, such that it becomes arduous to dismantle the buildup and discernibly remove the caustic aspects of development.
All of this while living in a society that absolutely rewards the malfeasance of arrogance, marketed and sold as self-confidence at the highest of levels.
So while this highlighted statement is plausible to the moral sense, it can also be said to be a false notion in real life applications. In my experience and in the shared experience of others around me it happens more often in the reverse.
I do hope that the awareness in what you have written here however, make this myth a reality instead of the exception.