I was just reading some other blogs and I realized something. Wouldn't detonating the H-bomb create a paradox for the Losties? I mean, okay, they go back in time, and set of a bomb in hopes of it changing the future so they never crashed. But when they set it off, they'd all die. So let's just say their plane doesn't crash. But then there wouldn't be anyone to set off the bomb because since they landed safely they wouldn't have crashed in te first place so they could set it off. And they couldn't get anyone else to do it because they wouldn't have any memory of the island, seeing as they haven't crashed. So that would create a paradox.
I think i might be missing something, but feel free to comment! This is my first blog by the way!