Bottom line is the Competition Manual and its rules regarding caddies has been in place pretty much unchanged for a number of years now, and the interpretation of them has always been that whatever violations the caddy incurs, the punishment is meted out to the player for whom they are working. There is no, or there is not intended to be, any wiggle room for the TD to take half measures or to treat caddy and player as separate entities. If the caddy commits an action that warrants a courtesy violation, the player gets the courtesy violation. If the caddy breaks a rule for which DQ is the required action, the player is DQed from the event.
To my knowledge, the rule as written hasn't been interpreted any differently by anyone until this thread. Stands to reason that if no one has yet brought up the notion that the text could be interpreted in an unintended way, there's no reason the rules committee would think the text needed to be changed. And the only way for the rules committee to know this would be to inform them and, if you're being helpful, to suggest an alternative wording that does accomplish what they intend with no room for doubt. If you're unwilling to do that, then you have no room to argue or complain about the job they are/aren't doing with the rule book.