It is the administration/leadership. You get what you demand. You demand nothing and condone everything, you get what you ask for. Sounds like the leadership at that school was excusing bad and criminal behavior. You make it clear to parents and students responsibility. They pay for what they “lose” or do without. They get the grades they earn. Get decent security instead of paying for destroyed property over and over. Make the parents pick up the food, if they want it. Demand a dress code. Accept no excuses. I know it isn’t as simple as it sounds. Tardiness won’t be tolerated. Lock the tardy students out.