There must be a way to make you stop when the words haven’t and blogging are stringed together in a sentence. Perhaps something like what the Write or Die app does when you stop writing. A song like Who Let the Dogs Out can be set to go off every time those words appear. That would make me stop.
There is a sense of obligation to a blog’s continuity, regardless of readership size, that compels a negligent blogger to apologize. See Cory Archangel’s Sorry I Haven’t Posted (via AFC.) Those of us who keep paper journals probably have a number of entries that start out as excuses to ourselves and future selves as readers (“Can’t believe I haven’t written in here since January! So much has happened since then…”)