Tacking on IMO doesn't give someone carte blanche to say whatever one wants. If one states something as opinion, it should be a statement of opinion, not a statement of fact (e.g., 'I think this has happened' not 'this happened'). Likewise, if something is speculation or hypothesis, it needs to be written as such (e.g., 'this could be the case').
One huge problem with the sleuthing in this case is that rumor and misinformation frequently get treated as fact, partly because a number of people keep presenting it as fact. People will make several statements of fact, tack on an IMO, then draw conclusions from the rumors or baseless garbage that they posited as fact. Once the garbage information gets subjected to speculation, it becomes fact for many, and then it's much harder to sort out truth from fiction.
It's almost funny, but there's been a fair bit of collateral damage to people because of going fast and loose with information here.