For a professional musician like Lauren, firing an unsuppressed rifle can be a career-ending event. Rifle reports are all too close to concussion grenade (flashbang) noise levels. Taking them down by 28-40dB makes a big difference. So does wearing plugs and muffs (or custom-molded amplified earbuds), but few people would have time to put those on in self-defense situations.
Tech details for the curious: