The question is: Why was Walt kidnapped? Did they plan on Michael coming after him? Did the Others plan to bribe Michael into leading the party of Jack, Kate, Sawyer and Hurley to the Others' camp?
- They kidnapped Walt because they knew he was special, but he turned out to be more than they could handle. They wanted to experiment on him, but they were surprised by his power, so when Michael came, they took the opportunity to kill two birds with one stone. Michael brought the survivors they wanted and they got rid of Walt. If they had wanted Michael, they could have snatched him when they attacked the raft. Also, it appears that the Others really intended to kill Michael, Jin and Sawyer when they tossed the Molotov cocktail onto the raft.
Get in on the discussion of why Walt was kidnapped