What I've generally found is that two people whose positions on an issue are far apart will move toward the middle after a debate or skilled explanat… - Annie Duke

At the moment that quitting becomes the objectively best choice, in practice things generally won't look particularly grim, even though the present does contain clues that can help you figure out how the future might unfold. The problem is, perhaps because of our aversion to quitting, we tend to rationalize away the clues contained in the present that would allow us to see how bad things really are.

When the outcome turns out poorly, it's easy to focus on the details that suggest the decision process was poor. We think we are seeing the decision quality rationally because the bad process is obvious.

The second is that making a plan for when to quit should be done long before you are facing the quitting decision. It recognizes, as Daniel Kahneman has pointed out, that the worst time to make a decision is when you're "in it."