Rule 17 expressly covers what may and may not be done with regards to attending the flagstick. Therefore Rule 1-2 does not apply, Exception 1 says so.
If that is not what was intended, it is yet another case of a poorly worded rule.
Rule 17 says nothing about whether or not you can use the flagstick to influence the movement of a ball. If I picked up the flagstick and knocked your moving ball aside with it so that it didn't go into the hole, what part of Rule 17 says my action was permissible?