I once had a close friend who was wounded in Vietnam. He was actually wounded several times because the VC were using him as target practice to try and lure others out to help him. Amongst other wounds, Jerry suffered severe nerve damage to his left arm leavving it painfull and about useless. For years he wantedd to get the arm removed to aleve the pain. We were able to arrange the removal - and then he started complaining about something else. Jerry took a great many pain pills that killed him, despite the professsional counseling and friends trying to help. In his note, Jerry said he couldn't go on any longer. Jerry checked out but left his wife and 2 children. Jerry was a friend and a hero, but left in a coward's death.
I believe the 9/11 people who jumped were trying to save their lives by getting out of the flames/heat/gases.
No, I don't know Leonard Woods personally. If I had, I would have certainly tried to talk him out of ending his own life.