Copy-Editing For The Morally Perplexed

Over the past two days, I have found three examples where I used 'but' to begin a sentence in exactly the sort of context in which I condemned its use here. Not only do I still know the difference between a foolish hope and a hope of foolishness, though, but I also eliminated all these erroneous uses of 'but' so my claim to the moral high ground is, I think, entirely safe. Entirely safe, I tell you.