Part 1: It was rooted in the Tzimtzum that the government of the universe should follow its course until the end. This means that flaws can exist...
You have already heard that the only intention of the wisdom of the Kabbalah is to understand the government of the Supreme Will and for what purpose He created all these different creatures, what He wants from them, what will come at the end of all the cycles of the universe, and how all these strange cycles are to be explained. For the Supreme Will Himself already calculated the entire cycle of government ending with complete perfection. When we speak about the Sefirot and the worlds, we are explaining these calculations and measures.