I don't know anything about war strategy, don't "know more than all the generals," but am hoping this all works out for the best.  On one hand, this bomb could disrupt not only ISIS' operations, but maybe also make them look weak in the eyes of the youngsters they recruit with clever social media marketing.  It might also give the US street cred around the globe.  On the other hand, I hope whomever Trump consulted are clear-headed military experts who won't spark off the "mother of all wars!"

As to why people "underestimate" Trump, there are so many obvious reasons.  For one example, Trump University was the creation of a careless, selfish conman.  Even you wouldn't try to rationalize that away.  Or would you like to explain what kind of triumph that was for Trump and its victims?