The selection for every team is always 'shrouded in mystery', whether it is a local rec league or an Olympic team in any sport, and whether it is a single coach or a large committee. With sprinters or swimmers or weight lifters, or other individual sports ... there is a time, or a weight, or a competition record that is clear cut, but a team is a mixture of individual skills and chemistry with a little magic thrown in, all predicated on a specific system and coaching philosophy and it is subjective process of selection. (You can look at the US Rider Cup struggles as a perfect example - no one questions the US team's individual records, put them in a team format competition and they have struggled to be competitive against lesser talents.)
I think keeping selection decisions private is to protect everyone involved - the individual 'not selected', the team members selected, the coaches, the selection committee. Any national team sport is drawn from a really small community from administrators to trainers to coaches to players and everyone is under serious pressure - airing the dirty linen isn't going to change the outcome and might screw up relations for years. Let the media write what they want and the 'disrespected' individual say what they want, and their posse foment their conspiracy theories and just go about the business of putting together the team for competition. You aren't likely to change anyone's opinions no matter what you say. If the selectors and or coaches and or players don't perform to their expected standards heads will roll and reputations will be tarnished.