Genius talent often carries baggage. Sometimes being really great requires mental wiring that is just different from the rest of the general population, but sometimes it comes from being coddled and pampered in order to continue the production of genius.
But the baggage can easily outweigh the benefits of the genius. At that point a negative reputation is formed, potential work is lost, and a career declines prematurely and for unnecessarily. Genius is wasted.
Everyone needs a jester on their life, the person who is always allowed to speak the unvarnished truth, and keep the genius in check. Without it, genius can become a burden rather than a blessing.