No, you can blame guests for trying, ESPECIALLY on a day like this. The CM's are already stressed to the max and your friends took advantage of the situation knowing they weren't entitled to the privilege regardless if the CM allowed it or not. If someone lets you steal, it doesn't make it right and they stole two places from legitimate on-site guests.
My wife and I had reservations for this weekend and decided not to go. I would never try to use that confirmation number to gain access to EMH. People who do things like this are why a lot of the little magical things at Disney have gone away. It cheating the system, no matter how you try to justify it or spin it.