Regular readers of The Times’ Opinion pages will know that, among the few letters published over the last week that have blamed the Democrats for the government shutdown (a preponderance faulted House Republicans), none made the argument about Congress exempting itself from Obamacare.

Why? Simply put, this objection to the president’s healthcare law is based on a falsehood, and letters that have an untrue basis (for example, ones that say there’s no sign humans have caused climate change) do not get printed.