I have to laugh. You have the fiduciary concept completely upside down. Fans have no fiduciary responsibility as regards a professional sports franchise. They are a paying customer. In fact from a fiduciary perspective in sports it’s just the opposite of what you propose. The team is a representative of the locale and oftentimes is the recipient of public funding for stadiums, practice facilities, access roads, etc. that places the team in a fiduciary position to its locale.
And while you’re right that fans aren’t invariably right (where did anyone ever say that?), they do have a right to their variety of opinion, perspective, etc. And they have a right to voice those, no matter how off or accurate they might be. And that certainly does not impact their level of being a fan (which is defined as a person having a strong interest in or admiration or a person or thing - which is inherently an internal and personal thing verses an external determination by someone else).
as for “trustee” and “custodian” I don’t think you know what those words mean from the context of your post.
You are also deluded if you think it’s the fans’ duty to come up with solutions. Fans are not paid sports professionals. They typically don’t possess the experience, knowledge or have access to the information or data to actually come up with solutions. And all that ignores the fact that they actually possess zero control and usually zero attention from the team. In other words, requiring fans to bring solutions is a fools game. Do solutions engender better conversation on a fan board? Sure. Does it make you a better fan? Not by any measure.
I want to congratulate you for your arrogance. We haven’t seen your level here in a long time.