[rayiner]

These aren't irrelevant prejudicial background facts--they're legally relevant. If you're with a gang committing felony robbery, the law holds you responsible if the situation escalates and someone gets murdered. If you describe the conviction leaving out the robbery, you're actively misstating the facts of the crime. And in this case, at some point fantasizing turns into conspiracy. It's incredibly misleading to leave out the facts of what happened outside the chatroom that might have convinced the jury that this guy crossed that line.