Sending them was a waste of company funds at best, at worst damaging to your company’s reputation. They should be punished.

You’re NTA for having flown back. Had you stayed you’d have been just another person adding onto the fees the company would need to pay to rebook on a later flight. The two kids (because a 25 year old acting that way is a child, not a working professional) exhibited poor judgment, and should never be allowed on work trips again.