No Justification!

I'm learning a bunch of new things in my writing class. They tell me it's the proper way, but I'm not so sure I believe them. I've posted before that because of what I like to call my "Monkish" tendencies, I have this compulsion to keep things orderly. I believe in my heart that paragraphs should be justified on both sides. Nice and neat. Perfectly straight. However, my writing mentor says that I should not justify the right side of my paragraphs. I'm not sure I believe it's true, but in the name of education, you'll notice that my paragraphs are no longer fully justified. I'll hold to the teaching as long as I can stand it. It's a jungle out there...