Don’t get me wrong: I think that introspection is a very important thing to do as one goes through life. Afterall, how else can one move toneself forwards, as a person, other than through identifying their own personal flaws and taking steps to rectify them?
That said, I think there’s an inherent problem with introspection, in that, almost by definition, only good (or, at least, redeemable) people actually engage in it. Truly evil people never doubt themselves, their actions, or their motivations, and so are capable of moving through life with a sort of absolute moral certainty that more virtuous people paradoxically lack. Thus, the Virtuous can be constantly be racked by self-doubt while the Villainous are free precisely because they literally do not give a shit.
Looking back upon it (which is, of course, further introspection, but of what I hope to be a more healthy species), I would say that this was my main problem in dealing with She About Whom I Am Sick of Talking; I was so busy trying to find the flaw in myself that she was able to walk right over me.
And that, God willing, is the absolute last fucking word that I have to say upon this subject.