There is this part in season 2 that I don't understand.
Ben (Known as Henry Gale at the time) manipulated Locke to stop pushing the button, it would have led to the end of the island if Desmond didn't turn the safe key, when Desmond did that and the sky turned purple and all, we saw Ben Linus very happy for this to happen.
But when the sky turned purple, this made the island visible to the outside world, which led to Penny find the island, but more importantly it made Charles Widmore find the island and send the freighter there, which is exactly the opposite of what Ben would have wanted.
So my question is, what was Ben's motive to manipulate Locke to stop pushing the button, and why was he happy when it would have led to the death to all those on the island if Desmond didn't turn the safe key?
I don't know if this was addressed before but please explain the reasons to me if there were any.