Somebody else mentioned in another post that there was evidence to suggest Richard Russel's marriage was in turmoil when he hijacked the plane.

I found that his most recently liked video was a very MGTOW video about diamonds being useless rocks. https://www.youtube.com/watch?v=oUKQm8lVUCE

Proof that Richard "Beebo" Russel "liked" the video: https://www.youtube.com/channel/UCiUjrP6pAMBqVlI2aKOzOyw/videos