You have personally used at least one tool, language, or framework without reading its code or understanding it beyond a surface level. You've done this because some text on some website claims it gets the job done. And you probably do this every day (e.g. your OS, your phone, your microwave).
People cargo cult because there isn't enough time to exhaustively research every topic from scratch. Civilization exists because we blindly trust whatever methods seem to work, and then iterate on them.