Jeremy liked to provoke a reaction, possibly due to the feeling that his parents were remote emotionally. There's an anecdote in Clare Powell's book of him using Julie to sweet-talk a man at a party, whereupon the former sprang out from some hidey-hole and confronted the couple. It's why he enjoyed the murder of his parents, why he enjoyed the attention of Brett, and why now he basks in the glory of his notoriety, influencing periodically the newbies and the diehard supporters alike as they suggest this or that future strategy, whilst knowing all along he will be incarcerated justly for his crimes for the remainder of his natural life.