On this, I will disagree. There is a line between what Jakob does — which is speak his perspective on the race, and outright bad sportsmanship. You made a Trump comparison, which is absurd. Jakob doesn't speak in "alternate facts." I've never heard him say after a race something patently absurd that would fit into that prism. The biggest leap in logic he's had is thinking that pacing a DL race after the rabbit drops off is the exact same as pacing an entire championship race — it's not. Outside of that, and maybe some subjective takes about his training system, best event, or the closeness of his competition to him it pretty much seems confident/arrogant, but by no means delusional.
Yes, providing no explanations is maybe the best "sportsmanship," but it gives nothing to the fans. There is a reason these athletes are interviewed after a race and people most want to hear the winner and maybe even more the person that fell short the most. You and some of the old-school sportsmanship thinking want them to say empty PC statement "Josh was better than me today. He had a better race." Well yeah, Kerr won — these are self-evident facts. If you want to see a cocky frontrunner get humbled and lose, that's fair enough. But why you need them to hold in what they think I don't understand — it is part of the story. Ultimately most athletes have an edge, and I'd rather hear them tell us the problems in their buildup, their tactical errors in the race, and where it all went wrong. Or you could have hollow sportsmanship, when the results are clear as day. We KNOW Josh won, there is no disputing it. No Jakob fan thinks Jakob was better — he lost! Why you need Jakob to say nothing in the name of sportsmanship, I don't know. It is infinitely more interesting to hear what athletes think.