I was having that same thought, especially after just seeing the preview that has not-Locke telling Sawyer he'll tell him why he's on the Island, being all smiling and reasonable and such.
And as others have noted, the bleeding Others are murderers, kidnappers, capable of breaking your neck, shooting you, or hanging…

Dammit, Nilknarf! Your comment just made me choke on the last bite of my fruit roll-up. And that's the best part!