Miracles have to have some sort of root. They can't simply just be random unexplained things. For a lot of people, it's divine intervention. That's how it happened on Battlestar Galactica. But it has to be rooted in
something. We haven't found out exactly what the island is yet, but it has to be something that explains how those "miracles" might have been possible. God, angels, aliens, crazy alternate reality where normal rules don't apply, it has to be something. But all those things would result in people being pissed cause deux ex machinas are still considered bad writing.