Ends Justify Means

There is a debate in Gemara as to what was first in regards to creation, Jews or Torah. It says that Hashem looked in the Torah and created the world, so one would assume that is obviously Torah. However on closer examination, one will note that Torah is, so to speak, pointless without Jews. With no one to follow it's laws it's being is unnecessary. Thus it must be that first came the Jews, and then the Torah.

Similar to this is all of creation. The ultimate thing for which we are striving is Daas Hashem Bilvad, complete saturation of the world in G-dly, and G-dness. That being the case, one would wonder why the whole thing with the Sin happened. At that time, there was no unG-dliness. Obviously, there must be another dimension to it. It is learned that Adam's sinning was in order to increase the power of his avoda by introducing the contrast of evil to the ultimate good that was in existence.

So to, in order that all things truely see and know G-d, there must be something non-G-d, so to speak. Thus, after years of persecution will be Mashiach times in which all will be revealed. In order for that to be, there must be the persecution which will lead to the understanding. For there to be persicution, there must be persecutors, for there to be persecutors, there must be disharmony. For disharmony to exist, the perfection of the Garden can not be where humankind abides. For humanity to be elsewhere in creation(aside from there being a need for there to be else in creation), somethign had to have been done to remove them. That thing was Adam sinning. For Adam to sin, aside from him needing to exist, so to did the object with which he sinned need to exist. Thus, Adams creation, and sinning, was all for the purpose that Mashiach would be able to come and all the worlds saturated with knowing G-d.