Practising failure is a great learning tactic, however unintuitive it may sound. One has to move into 'failure' territory to be able to attain mastery on a skill or subject.
One can commonly see it in tools like flight simulators, and other training modules where one has to go through the failure in order to learn the entire concept.
People look for experienced professionals in senior job roles with extreme levels of responsibility because they know that when there is no time to think about the process, and a split-second action or decision has to be made, only real experience counts.
Example: A pilot who has never stalled a plane and then recovered would not know the pressure, time and space that is necessary to make the split-second judgement.