Odds are not quite 50%, but close, that I know one of these folks.
The proper thing to do is
A) what the families want to have done
B) without a clear direction from the families continue with the Jamboree in the name of people who gave gladly to these kids for many, many years.
I see it as a sign of respect for life. At the same time, mine would be just one vote from the pastoral side of the house. Other opinions would not be wrong just because they disagreed with mine, imho. I cannot quote scripture to you that requires one or the other, however, there is typically a period of mourning, and I would not go against that period.
A period of mourning undergirds a high regard for the lesson on the sacredness of life, and I, therefore, would have me not change my recommendation.
I also believe it puts the President in a very awkward position. The media, already unfair to the Boy Scouts, could use it to cast the President as insensitive. I will not be surprised if they do.
I do remember one other speech in which the President addressed a tragedy, and then turned to the topic otherwise at hand. I wish I could remember the occasion of that speech.