Some writers say that they are God, they have complete control over their plot and their characters, and that if so-and-so doesn't do what they're told, too bad. Kill 'em off.
That writer is not me.
Trust me, I've tried many times to take that approach. 'The House on the Moor' was not supposed to end that way. It was supposed to end with a bit more...unhappiness. Obviously, it didn't work that way. That was not my fault. I plotted everything out, wrote along up to that point, and suddenly found myself pulled over and informed that there was now a new ending. It came out of nowhere! Granted, the story did work out nicely that way, but it would have been nice if they'd cooperated.