Who can possibly disagree with his right to do that? After all, no one questioned the right of the FTSE 100 chiefs to sign a letter saying that Brexit would threaten economic growth. There are good, compelling arguments on both sides of this debate, and it is important that the public gets to hear them all. That is why this newspaper has committed itself to putting all the facts in front of our readers, without bias. We will check the truth of big claims and pour cold water on baseless rhetoric. The debate should be calm and informative, not hyperbolic. But debate we must: individuals who have something to contribute, unless they are under official purdah, should feel completely free to do so. That is the mark of an open, healthy democracy. By contrast, last week the authorities in Turkey seized control of a popular newspaper associated with the opposition. Trying to stymie the flow of information is typical of authoritarians. The British should set an example by being as vibrantly liberal as possible.