[Coleus]

you have to realize they were in new territory probably using new equipment. Most campgrounds don't usually have wires like that nearby so it wouldn't have been on their minds. A "jamboree troop" is not your normal troop, you have a scoutmaster from a troop picked by the council to represent a "jambo troop" and most of the boys come from within the local Scout Council.

Even though they went on one or two practice trips in Alaska, being in VA with kids you don't really know, the stress and the excitement of it all, the leaders are not the same. I could see how an accident like this happened. I'm wondering how high the lines were.

[Anticommie]

Most campgrounds don't usually have wires like that nearby so it wouldn't have been on their minds.

You don't have to have power lines in your mind, but I don't believe neither of the four people raising the pole did not see the power lines when raising the pole.
When you are raising a pole, your head goes up and your eyes follow the end of the pole, power line is not a needle on the sky background, you have to be blind or under some kind of influence not to see it.
This is one of those tragedies which should never happen. The victims paid the ultimate price for their recklessness.