Why do you think Trump kept classified information on our military, and defenses and nuclear programs ?

I can only think that he either was planning to start war and finished the coup he started on January 6th, or he was going to sell the information to our enemies or even allies, or he was being childishly petty and thought it would hinder Biden for him not to have it on hand. Or simply to make him feel like a big shot and show them off to donors because of his personal insecurities. Especially after losing the election.