If we are to have any Kavod HaTorah we can not have entire communities dressed in the Levush of Talmidei Chachamim (Torah scholars).
Those who represent themselves to the world as Torah Scholars are held to a very high standard. This standard is so high that most of us are not there, and certainly not bar mitzvah boys who have not had many years to develop themselves to that standard.
To have teenagers carry the flag of “Bnei Torah” may spur some of them to these higher standards eventually, but the flag is going to get soiled.