It is a matter of sheer logic, something rational that can not be denied: there is no success without an attempt. Not all attempt are successful. As a result, failure is a part of the road to success.

Logic. Undeniable. Inevitable.

It should be clear enough that we have to accept failure and try to learn from it. Make the best from the worst, understand what was wrong and prepare for the next attempt. From failure we can learn, learning will make us better at what we do and eventually it will lead to better outcomes.

But we are emotive beings and our reactions are not always rational.