Emptiness and Mental Disposition
There is a difference between conceptual understanding of Emptiness, and experiential realization of Emptiness. The first is at best a simile, a model, leading to the second. In worst case the first can even be an obstacle to the second.

Because of its nature, experiential realization of Emptiness may have demotivating effect. It certainly also has liberating effect, but there is demotivating effect as well. Which is pretty expected, considering that it cuts off the root of desire.

So, if the person has not developed strong Sila (ethics, altruism, compassion) and strong Samadhi (here, mental discipline, control over one's mental/emotional state) premature realization of Emptiness may make person either somewhat unhinged or else rather meek, depending on disposition.