Yes some people are attributing his decision simply to the perception that he was upset. But you're attributing the outrage and the calls to trade him simply to the fact that he fumbled the ball. And okay, so maybe this would have happened no matter what. It still would have been a completely boneheaded move and I still would have been screaming at the TV the second he took it out of the endzone. You know, exactly like I did before I even realized he was moping on the sidelines. Because it was a boneheaded fucking move, the Packers aren't good at kick return blocking, and there's maybe a 10% chance to get the ball past the 25 in that circumstance and like a 2% chance of getting it to the 40 yard line. So okay, let's ignore all the talk about his emotions and just call it what it was - a boneheaded play with almost zero potential upside when a player was explicitly told not to do that thing, compounded by a fumble, by a completely expendable player at the team's biggest point of success coming up on the trade deadline.
Just like his emotions were only a part of why he did what he did and how much of a part is completely up for debate, so is him fumbling only being a part of why people suggest that we trade him. Which was the entire point I was getting at. We're not saying we should immediately trade Aaron Rodgers (or at least most of us) when he gets mopey and makes boneheaded plays because he is dramatically less expendable both in terms of players currently on the roster and available elsewhere, contributes a much more measurable amount positive to the team than Montgomery does, and is getting dramatically more playing time (which is tied into the previous two points). People give Rodgers shit constantly for "freelancing" and "not running the offense" and "ignoring open receivers" and "forcing balls deep" and "being a stat whore". But he objectively does dramatically more good for this team than Montgomery does.
Again, I've been a huge fan of Montgomery since literally his first preseason catch. He looked like a fucking beast out there. I don't think he's being effectively utilized in this offense and I think he could be much better utilized with some more intelligent playcalling. He's not going to be utilized that way as long as McCarthy's calling plays, and he's not doing much for us as-is, so let's trade him if we can get something for him. This was just the tipping point.