I vividly recall, once the US had the most formidable force since D Day assembled upon Iraqi soil, then Senator Biden publicly stating "We absolutely will not attack Iran". The wisdom of invading Iran not withstanding, can you imagine President Trump making as foolish a comment? And Senator Biden had many years sitting on the Foreign Intelligence Committee. If that kind of incompetence comes from years of study, I'm willing to give a Mr. Trump a chance. 
I don't disregard the fact that Mr. Trump is vulgar by Oregon standards. but at one time in my life I believed some people were successful IN SPITE of being jerks. I came to realize that for a significant number of people, some are successful BECAUSE they are jerks.