Because successful OCD-therapy requires such comprehensive changes to the subject, it must be done very frequently, for a fairly long time, with somebody extremely competent.
The obsessive-compulsive is a crypto-narcissist: he sees the world as revolving around himself, much like a young child, and the presence of others, with their failure to bow down to him, infuriates him.
To have OCD is to consciously experience the compulsions that others only experience unconsciously. Thus, where the non-obsessive-compulsive has the illusion of freedom, the obsessive-compulsive has the illusion of its absence