Chaplin
Better off silent
Actually, Desmond "changing" future events by altering current events is plausible given all the philosophical references they have gone into plus the idea of "possible worlds" is still out there as a viable explanation - in my opinion.
shawn
Using that rationale, you're saying that the backpack they found could still be Penny's even though it wasn't her that fell from the sky?
I tend to suspend disbelief for this show, but that's just a little too much, IMO.