The explanation of TWA 800's explosion has been validated by "Mythbusters," who are really good at recreating these things. In fact, they got a tremendous explosion that surprised even them.
People don't want to let this go because it happened on Clinton's watch, like the anti-FDR people still cling to the "FDR knew about Pearl Harbor" crap. Stuff happens sometimes. Lee Harvey Oswald acted alone. The Japanese did achieve suprise on Dec. 7. Sacco and Vanzetti DID kill that guard. The Rosenbergs were guilty. Just because something fits, or doesn't fit, one's political desires doesn't make it less true.