Isn't this part of the snowflake generation, the over protective my kid can do no wrong bullshit some parents are afflicted with.
Kids are told to stay in their rooms. Not to go in each other's. They are old enough to comprehend this. They sneak out to check the teachers are busy so they can roam the corridors and go to different rooms.
They spot the teachers at dinner, some have drinks with their meal.
Responsible parent attitude:
Why were you out of bed and breaking the rules, do you understand why for your own safety it was important you stayed where you were supposed to be. If you can't act responsibly you can't go on these trips. The teachers are adults and responsible ones at that, they were simply having a drink with their evening meal and they are not the ones who have done something wrong. You are.
Snow flake parent attitude :
Were they drinking with their meal, that's shocking, let me complain to the school, you were in such a dangerous city, they were in charge of you. They must have been getting wankered, I'm furious, let me complain.
It's really quite disturbing.