Reason for Major Tetley's suicide
I'm afraid this may seem like a really obvious matter, but I have seen the film several times and read the novel once, and I still find myself puzzled as to why Tetley killed himself at the end.
Was it because he had been the self appointed leader of the mob and acted as an authority figure, giving orders to the rest, so he may have seemed more guilty than the others?
Does his conscience really bother him that much? Or is it the idea of taking his own life privately, rather than go through the possible shame of a trial and execution publicly? His " good name" having been forever tainted?
Notice how the obnoxious loafer Smith tries to shift the blame on to Tetley at the end. Perhaps Tetley couldn't live with the thought of forever being held in contempt and blamed by the whole town for what happened, as if no one else had had anything to do with it. Almost a Nuremburg type defense, that they " were only following orders". On the one hand, Tetley was in fact more responsible than anyone else, organizing the events and appointing himself the leader of the mob. But he also would be a perfect scapegoat for the rest of the towns people to try to lessen their own involvement.
And when he crossed the bridge, the phantoms came to meet him