Whatever it was that was so shocking about South Carolina congressman Joe Wilson’s “You lie” outburst during President Barack Obama’s health care speech on Wednesday, it wasn’t the simple breach of decorum. Decorum, if you haven’t noticed, is extinct. We lost it long ago. I’ve become increasingly sensitive to its departure, not only because of what goes on daily in the news – or the cable TV screechfests that pass for news – but also because of the sour tone of political discourse that takes place in The Spokesman-Review’s own letters column.