I suspect Trump is a strategist and a good poker player. He uses his alleged temper as a tool. He has been too successful for too long for that temper to be out of control. Getting angry is a negotiating trick.
He also understands that some victories are not worth the cost. He will keep the swords sharp and on display, but mostly in the scabbard.
Seeing Trump has business interests around the world, why would he possibly nuke them?? As previously mentioned, an uncontrolled temper does not get one far in the business world....especially in the international arena. The author is an idiot or actually hoping for a war.