Maybe some people think it's great that he insulted McCain's service, but the reality is that is only going to lose you votes. And in the end, you can't do what needs to be done if you can't muster the votes.
Trump’s attack on McCain was a key turning point in my own mind in the 2016 election campaign. I didn’t care for the content of his attack, but I found his willingness to put that duplicitous @sshole in his place without any concern about political correctness quite refreshing.