All simulations are 'unreal' is some sense. However, the training literature is very clear that the best of realistic simulations are very effective. Airsoft that is well-designed and refereed, computer shoot ranges or sims usage has been shown to aid military and police. There is not reason not to think that it won't work for civilians.
Simulations work for pilots, train engineers, fire fighters, ship captains, and a myriad of other critical personnel. They build quick and efficient automatic (System 1) responses.
Until we can shoot people dead and resurrect them for another run - that's the best we have. Better than just the square range.