It should be like that, but Erik Ten Hag didn't do it. And even for me, a coach must be ready to defend and accept the mistakes made by his players, let them talk about it internally and don't say it in public. In public, the coach must have a chivalrous spirit and defend his team's children, even though it may be that their students are really in the wrong. Great coaches always do this, defend their players.
They have an internal that will not be touched by the public, so they can evaluate everything more privately. And when the situation is closed they can take firm action against the players who made the mistake. As coaches, they not only think about what is important for the team, but they also have to protect the good name of their team. Likewise with players, they have to look after each other, including protecting the good name of the coach who handles them.
Yes you are not wrong that a coach should protect his player from the public but i don’t think that there have been any case here where Ten Hag threw Sancho into the public. Ten was asked in the interview why he didn’t select him and he blatantly said that only players that trained well were in the squad. Which means he was more or less hiding something, it was even after Sancho made that post on his social media account that the media got to know about the real thing. Sancho misses training and you expects a manager to call him out.
People say Ten Hag didn’t even help him but who allowed him to go for therapists for three months on the mountain to clear his head. I just feel like Sancho seems he is bigger than the club and it was definitely ok how Ten Hag treated him, had it been he was better than how was we would have seen him getting many clubs coming after him but one thing is nobody will want a player that stands against his manager.