Have seen some 'social media' complaints from folks about an illegal formation call made by an NFL crew in the past couple of weeks, with statements like, "Why would you call that at that point in the game?" And, "The player was told he was good." Of course, the complaining folks were fans/members of the losing team.
This is really simple, fans and coaches. Learn the rules. Know what constitutes a lineman versus a back. Stop trying to push the envelope in an effort to get some sort of advantage. This should never have been an issue. You know, if a guy is supposed to be on the line, why would he NOT want to be as far forward as he can legally get? What? You can't look down the line and tell - for yourself - that you are breaking the waistline of the snapper? (NCAA - don't know about NFL, but, they, too must have some line of demarcation.) Don't try to blame it on the officials. He claims he was told he was "good" after he adjusted himself. Baloney. There ain't an NFL official in the universe that would tell you that your position is good and then flag you. He probably got no response from the wing after he repositioned himself, and took that to mean he was good. Sorry. Not his fault. If he suggested that you move up when you first took a position, you got way more than you should have. In looking at the video, if you had moved two feet more, you would still not have been in the neutral zone. How can you not see that, and not get yourself on the line? Take responsibility for yourself.
Now, as wings, helping junior high, and even JV, kids get aligned is definitely something we should do. But for HS varsity and beyond, as wing officials, the only thing we should do is - using our back foot - mark the back end of the ball (Team's A LOS), slap our back leg, and state, "This is your line of scrimmage." You can certainly do this even if he isn't seeking your help, you know, get his attention with the leg slap and verbal statement, and hope he gets the message. At those levels, we aren't there to coach them. Let them, and their coaches, take responsibility for getting aligned.
For all we know, he WANTS to be in the backfield (and somebody else is out of position). I would never tell a varsity HS, or higher, player to "move up," or "move back." After the first time their position is questionable, I might try to get his attention between downs and tell him that, if he is supposed to be on the line, then move up - get on the line. Or, if he is supposed to be in the backfield, move back, to make it clear. Then tell his coach he has been 'advised' about positioning. Then, if you have to make a call, no one is surprised. They won't like it, but that's the most we can do for them.
Don't want a call to go against you in the critical moments? Don't put us in that position.