Not sure I entirely agree with this one. Letting the numbers count down was obviously wrong in that context. That said, the failsafe did work as intended and removed the Swan for good. The other stuff, still not sure. Ben plays everyone, not just John. In fact, Ben fools Jack a lot more easily. Also, John's sense that he wouldn't be killed by the Smoke Monster was, in fact, correct, just like his sense that Charles Widmore would kill those left on the Island was correct at that time. Not to mention that his reaching out to the Others instead of participating in a pointless war was the right thing to do, even if the Others were mostly nasty and mean. His downfall was being conned by the MiB and Ben, and it was hard to foresee given the extreme circumstances, and the fact that he was given the thankless job of trying to get people who never should have left in the first place back to the island. While he was conned early on into believing the Smoke Monster to be a neutral entity, his belief in the island and in Jacob (and in the Hatch and even that the Others were more than just evil) was correct. I think less people would have died if people had followed him.