Trinity, the high school in The Chocolate War, is all about lack of choice. Brother Leon and The Vigils spend most of their time forcing the student body to do things they don't want to do. For our boy Jerry, the chocolate sale represents his total lack of choice. When he chooses not to participate, he sails into dangerous waters.
Jerry shouldn't have openly defied The Vigils and Brother Leon; behind-the-scenes investigation and planning is more effective than open defiance.
Jerry's biggest mistake is choosing not to organize resistance with the other students.