Ok, thinking about this now, it doesn't really make sense. Let me know your thoughts.
Here are the current term of events: Swan station hits energy, they must create the hatch which causes the plane to crash on the island
IF they blew up the swan station: They never landed on the island in the first place, so why would they ever go back to the island.
Wouldn't it all happen anyways? Because if they blew up the area, in their mind the hatch was never built, then they never landed on the island, then they had no reason to go back to the island, nor would they have the opportunity to go back in time. So therefore, wouldn't the hatch still be built if they weren't there? It seems like a revolving door...
So my thought, the bomb caused the hatch to be created, and the bomb sent them into the current time where they were supposed to be.