I think regardless of whether you bet against the public or with other options the most important thing is one thing that understand the dangers that always lurk you at all times, because in any case defeat will always be part of the game, but I also agree with you that most likely the gamblers who are able to control themselves and their emotions are those who are already experienced enough because of course they have gone through various situations and maybe make it a lesson so they can be better as a gambler.
Regardless of any gambler's experience, everyone has different approach to auditory, vision and sensational actions. When the public are on the side of a team, they consist of both the experts and the newbies. Only a player who doesn't get moved or respond to things he's heard others say about the game would follow his decisions. Other than that, experience helps but in most vital cases state of mind controls how money is wagered on a game.
Having in mind that no game is a sure game makes gambling to be of the mind and not of public opinion, because regardless of the level of the support the public may have on a team, it can never aid them to win a game that their poorly played, so for a gambler what we have to know is that, there will be a time when we leave the public behind and focus more on our own inner believe and convictions.
Having the mindset of what gambling really is which is risk and luck, helps us alot as both spectators and gambler's, even player's also need such mindset to build inner confidence.