Why do True Gurus remain hidden?

The world is not ready
Yogananda said if all the power was given to a novice his body would burn up instantly. Even if a fraction of the power is given it would be misused. We are all emotional illogical greedy creatures!
Thus only a fraction of the power is given only to those who chose to correct themselves and not the world. We are so weak we cannot even correct ourself , let alone correct spouses, friends or children. And such ego, they want to correct the world. What absurdity