Is Trump too impetuous to be president?

What worries me is that Trump gets so angry about things - Comey, the media, Comey, the media, the intelligence services, Comey, disloyalty, the media - how can he get his emotions assembled in the right frame to make massive decisions, like what to do about Kim Jong-un who just will not go away. Trump's sacking of Comey was building up over many weeks, or so we are told by Trump and his loyal press spokespeople. But to the rest of us mortals it looked pretty damned impetuous. He was sick to the teeth of Comey going on about the Russia investigation and just like that said to himself, Comey you're dead meat. Enough. Get me the attorney general and his deputy whatever his name is and we'll cook up a good reason for terminating this 6ft 8ins pain in the butt. Voila, Comey was gone! Now what happens when someone rushes in with the latest CIA intelligence which states that Kim Jong-un is at that very moment rolling out a mighty ballistic missile and it looks like it might have a nuclear warhead at the top and there are people in white coats fanning out all over the place. This, Mr President, could be it. Kim is going to do it. The impetuous Trump might say, this guy has got to go, put our nukes on high alert, get that THAAD machine revved up, let's splat him before it's too late. Well, ok, no president wants to be the one who failed to take action when North Korea was about to launch a nuclear ICBM at Hawaii, but that's the sort of decision-making that needs a deep-thinking president capable in a few minutes to assess all the angles and to pick up the phone to Beijing and Moscow and then make the best decision. Impetuosity is not what is needed. But most people in the White House seem to be afraid of Trump, certainly afraid of his temper. It will be times like this when HR McMaster, supremely cool national security adviser, and James Mattis, hard-nosed veteran combat commander and defence secretary could just save the world.