At first, there was punishment.
There were prophets who warned the people—for there is no punishment without warning.
There were people who understood what they were doing and did it anyways—for there is no punishment without conscious intent.
And so, up to and including the destruction of the First Temple, there was punishment.
But then came a time when there were no prophets to provide due warning. And rare was the man who had the power of mind to intentionally sin. The suffering that occurred then, since the time of the Second Temple, cannot be called punishment. Instead it is called “tikun”—healing, repair. Souls of past generations returned to this world to be repaired by standing firm despite great challenge and tribulation.
Then came the master of the hidden wisdom, the great Ari. According to his disciples, with his teachings he repaired all the souls of Israel.
It follows, writes the Mitteler Rebbe, that the sufferings of the Jewish people since the Holy Ari, of blessed memory, are neither punishment nor repair. If so, what are they?
We do not know.
One thing we do know: We know that we are witnessing something beyond our ability at present to understand.
But simply because the human mind cannot know a thing, does that mean this thing cannot exist? Because we cannot give a reason, is there then no reason?
Or perhaps it simply means that we should be a little more humble, since we are not the ones who made this world. We must wait, and when all the drama is done, then we will know with the knowledge of the Author Himself.
Only then, once we leave behind forever these dark clouds, will we fathom and truly see that all the darkness was truly a profound form of light.

It is certainly true, we don't know. His ways are higher than our ways. It seems to me though, that if heaven is to come to earth, we should know. If we just accept things as they are, where is the seeking? "Seek and you will find, knock and the door will be opened."
Just because we don't yet know, there's no reason to believe we are not suppose to or should stop seeking to know. You can learn a lot just by wanting to know.