Just had an interesting thought. Remember Locke's vision with Boone (when he was in the sweat lodge)? Boone told him he had to clean up his mess.

What if cleaning up the mess meant (in Locke's mind) taking on Ben and the Others? After all, it was Ben who lied to him and caused him to lose faith in the island and what he was doing.

Perhaps he is trying to set things right by doing things which would nullify the Others' strategic advantage (destroying their means of communicating with the mainland and for their submarine to home in on the island. (Besides getting revenge on Ben for manipulating him).

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charlie98210
"Whoa!" she said. "Cry 'Havoc!' And let loose the dogs of war!"
And, like Banquo's ghost, they just won't go away.