No, if it was merely a matter of incentives, the behavior of parents should have reverted when the fine was removed; i.e. when the situation was restored to its

No, if it was merely a matter of incentives, the behavior of parents should have reverted when the fine was removed; i.e. when the situation was restored to its initial condition. But when the fine was instituted, a culture shift occured, which would then not revert when the fine was removed.