The whole idea of La Palma mega-tsunamis has been roundly debunked by many tsunami experts. The problem is the media hasn't bothered to give any pub to the debunkers, because the original story is so exciting.
As has been noted, terrorists with enough explosive power to actually detach part of La Palma would likely be better served simply using it directly somewhere.
Hopefully, you are correct. I've also read articles supposedly debunking the La Palma theory.
The purpose of my post was to alert people to a possible threat, and if none existed, no harm done....