I feel for you! Sadly, scouting was originally created to get boys out in the woods, was it not? Slowly, over years, they have taken that away due to the "danger" of it.
How about starting them off slowly? A sort of Q & A class, or classes? What if situations? EASE them into it. Present scenarios, go over options, explain what is good, what is bad.
Perhaps go over "safe" issues such as dehydration, exposure, etc. But, explain it in a kids way: "Who here has been so thirsty their lips have been chapped? How about SO cold your fingertips dont work?" Things of that nature.
Other than that, chalk em up to no-load, ah, well, I wont go any further with that one