Lama Ole’s answer:
In any situation, one should treat people like grownups and tell them that they have to face the consequences of their actions.
Many grownups are like children. They don’t know what’s right and wrong, and thus they behave like children. Then one has to tell them, “This will be rewarded like this and that will be punished like that. This is how the world works; now make your choice!” Cut through the situation in a cheerful, beyond-personal way, and tell them clearly: “You have to leave now, please,” not “Unfortunately, I have to….” Because if one treats grownups like children, then they will behave like children. And if children don’t have to face limits, they will become neurotic.