Jedi is as valid as any other belief practice a person chooses to hold and exercise.  I do not, for example, believe a word of the Book of Mormon, yet I regard the Mormon faith as a valid belief system and their moral codes are very real and effective.

I wonder what your complaint is, all in all, against a group which teaches and values Justice, Self-Discipline, Defense of the Helpless, and Personal Integrity as integral virtues?