I disagree with some of the notions in this thread, like "deleting" losses or needing "amnesia" to get past them.
That implies a problem with emotionally handling losses, problems that could lead to more problems, like chasing. It's better to understand why the losses would affect you, then work on the psychology of gambling. It's not for everybody.
One must remember there are probabilities involved and variance in results. If that is understood, then emotional problems arise with things like betting too much and losing that bet. It boils down to patience and discipline.
It's ridiculous to think that you will win every bet, so a loss shouldn't affect you that much. They need to happen.
While most mistakes in capping can be rooted out before the game goes off, there is value in having and maintaing a "rearview look" at all results, including losses. Tracking is doing just that.
If you are forgetting your losses or not looking at them in retrospect you're not tracking your bets. That's a mistake.
So, you can see, I disagree with some of the notions in this thread.