Simulators

george writes:

By flying and training with instructors who actually fly..

If the instructor or student makes a mistake, then what?

In a real aircraft, training for emergency situations may be more hazardous
than not training for them, particularly if the emergency is rare in normal
operation or is difficult to recover from.

In simulators, the cost of training for recovery from a specific emergency
must be balanced against the cost of training to avoid it, or training for
some other situation. Another consideration for simulation is whether or not
the simulator correctly simulates unusual situations--the most accurate
simulators are driven by databases built from actual test flights, and if
there is no data for a specific flight regime, the simulation cannot be relied
upon. At the same time, however, the regime in question might be so dangerous
in real life that using a real aircraft is out of the question.

Do airline pilots train for spin recovery in their airliners?