Canonicity is something everyone should decide for themselves. The creators of a work of fiction provide the initial spark with the material they publish, but the world, the story, and the characters unfold in the mind of the audience. Since the audience's imagination is necessary to (re)create and hold together a truly believable world, it is each viewer individually who decides which elements are true to their impression of that world.
Some might argue that not treating everything the creators say as law is an act of disrespect, but if you think about it, it really isn't. It's the opposite in fact, it celebrates the work in question. If you care about a particular fictional world so much that you fully and willingly immerse yourself in it, think about it, interpret it, and even invest a piece of yourself in it, that is pretty much the ultimate compliment any creator of fiction can receive.
So really, as long as you're not a dick about it, everyone should be allowed to have their own canon regardless of the canon canon. Canon canon canon.