Many people have a memory of the wise advice of Yoda that said "May the Force be with You". And true, George Lucas's Star Wars movies were very instrumental in bringing to the forefront the concept of an all-permeating force that was used for good by the Jedi knights. It also thoroughly showed how that same Force (when applied for bad purposes) would corrupt those who use it that way.
Still, the saying "Power corrupts, and absolute power corrupts absolutely" is not what this story tells: there will always be those who defend the world around them by proper use of the Force, and unless they are completely defeated they will prevail. That is why evil is always fighting to expand at the expense of all opposition.