Now Trump joins in: why was that gunman on the roof?

A week has gone by and still no one has given an answer to the biggest question of all right now: why was Donald Trump's would-be assassin able to climb on to the roof of a building within range of the former president and fire off four rounds? Trump was initially full of praise for the Secret Service who bounced on to the stage and covered his body within seconds of the first bullet skimming through the top part of Trump's right ear. But now he has begun asking the same question as every one else. Why was the gunman on that roof? And why, when people wandering around outside the convention spotted the man lying on the roof with a rifle, wasn't the alarm raised instantly? Like a phone call to the Secret Service? There's a lot of speculation about the roof being in a blind spot fronted by trees that obscured the Secret Service's view. But the fact is, as soon as those shots rang out, a Secret Service sniper on a roof adjoining where Trump had been standing shot dead the gunman. So he must have had a clear line of sight. As for that rubbish about the gunman's roof being too dodgy, health and safety-wise, for a Trump sniper to lie on, if an assassin could do it, why not one of Trump's protectors? One can only conclude with that sort of explanation that no president or former president in the United States is safe.