I know this is a popular theory on here, and while I don't know either way, I am pretty hesitant to conclude this given that I am not a doctor nor have any of the required information to make this conclusion. I think a lot of posters think that medicine is this 100% perfect science where there are only right and wrong decisions, and the team is the only one making the decisions, but in reality, there is a lot of uncertainty in terms of diagnosing injuries and the recommended therapy, and in reality, the player is involved in this process every step of the way. And in fact, and as we have seen with some players, can get a second opinion. And there are always risks associated with any potential path, and sometimes unlikely risks materialize. These aren't necessarily "mistakes" but are perceived as that.
And on Pettersson in particular, there really is zero evidence that his injury was mishandled. Dude's getting paid 11.6 million dollars per year, and if his injury was really so bad that he was scoring at 50% of his normal pace for an entire year, then how is he not questioning whether he should sit out, or getting a second opinion? Instead, he's playing voluntary games in the Four Nations tournamen? Like, at some point, even if the medical staff has screwed up, the player needs to take some accountability.