1) In what context was it necessary to dredge up Hillary Clinton, Barack Obama, "Fake News", "Fake Polls", and repealing ACA, at the Boy Scout Jamboree?  I'm real curious as to under what context those were brought up.  Those issues seem to be things that one needs to go out of their way to mention.  Past presidents that spoke at BSA Jamborees seemed to be able to avoid mentioning election foes, previous presidents, and the media in negative lights.  Therefore, either Trump did so intentionally, or he inferior in his ability to not go down that path compared to past presidents.  Which is it?
2) Yes...the polls speak for themselves.  They weren't wrong.  Electoral College projections were.
3) Trump, his whole life, has been about personal loyalty.  I somehow doubt that, at age 70, he has changed his meaning of "loyalty".  Ironic that you mention things like unethical or dishonest behavior.  Trump is the epitome of such behaviors.