Appears Biden took the letter from JFK Jr as a threat when JFK Jr called Biden a traitor. This appears to be connected to a failed kidnapping plot on JFK Jr. https://www.reddit.com/r/conspiracy/comments/jzl9l3/in_regards_to_a_foiled_kidnapping_plot_jfk_jr/ https://people.com/celebrity/jfk-jr-kidnap-threats/ https://www.intouchweekly.com/posts/jfk-jr-death-columbian-drug-lord-may-have-planned-a-kidnap/