Lack of knowledge of the Liquor Act from the manager and security.
FYI, a responsible adult, in relation to a minor, means an adult who is -
(a) a parent, step-parent or guardian of the minor, or
(b) the minor's spouse or de facto partner, or
(c) for the time being standing in as the parent of the minor.
If the adult is intoxicated or has a disability that prevents them from 'controlling' the children, fair enough. Please educate staff so as to engage in discourse or it could easily be misconstrued as discrimination.