Sorry you had a rough time at the camperall.
I am wondering, was this weekend trip actually planned for ALL aged scouts, or was it planned for BOY SCOUTS and the Cubs were just invited along?
We had a similiar experience at a camp we went to as Webelos I. We spent a winter weekend at camp with the Boy Scout troop, and also had a Be Prepared theme. We had 12 different stations set up around the camp. We had a map to find each station and then complete the task at each station.
One station had mock accidents set up, with the Cubs as victims. The Boy Scouts were the rescuers. The Cubs loved that.
Another station had pretend water rescues, all ages could participate. They loved that too.
Another station made us build using lashings. The Boy Scouts could do it. We were Webelos I - we didn't know how to do lashings - they were frustrated with that.
Another station had us build a fire to melt snow to make water. You made the fire with only what you had with you. The Boy Scouts knew to bring matches. We're 5th graders, we don't carry matches - they were disappointed.
Another station had them pulling their sled across a gully where they could have gotten hurt because they we to small to cross safely. The Boy Scouts could do it. We didn't let the Cubs do it. Again they were disappointed.
My point is, the weekend was geared toward the Boy Scout aged boys. It was a camp designed basically for them, and the Cubs were invited along just to get an idea of what Boy Scouts was like.
None of the leaders running the stations expected our Webelos to know how to do lashings or build fires. They just wanted the boys to get an idea of how to do these things.
Could this have been the intent of your camp? Was it just to expose the younger Scouts to what Boy Scouts is like? If that was the case, then I'm not sure I would write any letters, because the camp volunteers did what they expected to do - set up a BOY SCOUT campout.
If the camp WAS supposed to be set up for all ages, then I would suggest someone from the Cub Scout Pack volunteer to work with the Camp Committee. That way, next year, the Cub Scouts will have a voice in the programming and be able to have some Cub appropriate activities too. (I can't believe even a Boy Scout would want to sit through a 2 hour GPS presentation).