The fact that the caller may have an ulterior motive seems irrelevant to me. A violation is a violation. But why have the end of the tournament be the arbitrary cut off time? The day of the infraction makes more sense. If the violation is discovered later, so be it. Bad calls occur in all sports.
Jim,
The possible motivation of a caller is very important and gets to one of the primary principals of the rules of golf in tournament play.
Every golfer in a tournament is also obligated to bring to attention any rules infractions, weather by them self,or by others. To purposely ignore a rules infraction is it self a violation of the rules of golf. The rules officials and the tournament committee are under the same obligation to call to attention all possible rules infractions.
This protects the integrity of the tournament (no doubts that some contestants are being treated differently than others), and it protects the players who call a penalty on another since they are REQUIRED to do this.
When an outsider is lacking this obligation to equity, it actually reduces the integrity of the tournament, rather than enhancing.
Although it sounds fair enough to allow an outsider to bring to attention a rules infraction, since that outsider has NO obligation to do this, and since the outsider can choose to call in or not call in the rules infraction, eventually it will lead to un-equal treatment. (Would some parents not call in an accidental rules infraction by their offspring when they know it had a de minimis impact on the outcome; unless of course the rules infraction was by someone 1 stroke ahead of their offspring.)
Therefore, to protect the integrity of the competition, it is essential to minimize this risk of inequality by NOT accepting outsiders to submit rules infractions.
The other problem, is that their can be many circumstances in which the camera view or other circumstances not obvious to the viewer change the perception so that what appears to be a rules infraction to an untrained outsider, is actually within the rules.
I would limit this outright ban to have the Committee to consider calls about possible deliberate known cheating, since at that point that competitor has them self failed their own obligation of equity to the field.
Also, the matter of not enforcing rules infractions discovered after a tournament is completed was not a proposal on my part, but rather is and has been for decades, the current rule. Especially for professional tours, it is impractical to do otherwise.
I suppose someone has an example of some local or regional event where a competitor DQed after a tournament was completed. But the current procedure works best for tournaments (especially pro events, when having to later redistribute prize winnings could get too complicated). The practice has been well considered and discussed many many years ago, and does work best.
I suppose if a player was ever discovered to have purposely cheated to a win, a title could later be stripped, along with other penalties that already exist (i.e. banned for a time period).