i think the unwanted thoughts are our subconsious mind speaking. our subconscious minds are busier than we realize they are! i think these thoughts are similar to dreams and nightmares. so maybe, it would be good to recognize them as "nightmare thoughts." we don't necessarily believe our nightmares and usually just shrug them off as merely scary. that's what you have to do with the scary unwanted thoughts. our ability to shrug them off shows that we are mentally healthy - something to actually rejoice about!