Final answer:
Blackie's main conflict in 'The Destructors' is the struggle between his anger at losing his leadership position to T and his desire to join the plan for the gang's fame.
Step-by-step explanation:
In "The Destructors," Blackie's main conflict is torn between his anger at the gang for following T and his own desire to join in the plan to destroy Old Misery's house. Blackie experiences a sense of loss over his leadership position and struggles with the reality that his authority has been usurped.
Despite this, he acknowledges the potential glory that could come from the gang's destructive plan, realizing that it could lead to fame across London. This inner turmoil is eventually resolved by his ambition for the gang's recognition, prompting him to return to T and participate in the plan.