I think the significance of the "drop-out" factor is that the organization forces, induces, inveigles, seduces young people to drop out--either from high school or from college.
That forecloses a lot of future possibilities for them. Among the older members of the organization, the sizable number who dropped out of college to join the NCLC lived to regret it--because now they're in their 50s and they never got a college degree, so the possibilities are narrower. Many people who were encouraged to drop out are very bitter.
Of course, those who actually pursued degrees and, worse, graduate degrees were vilified for thinking they were "smarter than LaRouche," and for being impotent weanie-academics, or haughty, or epicene.
LaRouche likes people who are young and wide-eyed and idealistic--easier to seduce. He hates the older, more educated ones--they're harder-headed, harder-hearted, and skeptical.
So of course he wants people to drop out of school. And remember, he dropped out of Northeastern after one year--he doesn't want to be surrounded by people with academic degrees. In fact, it's vital to his self-image that academic degrees be spat on and held in contempt.