When hunting, make sure you identify your target beyond any doubt before firing. Wear fluorescent orange clothing to identify yourself clearly to other hunters. Never shoot at a noise, or at movement in bushes. You don't know for sure what it is. Do not shoot at targets on water, or into the air.
Bullets can ricochet off water and keep going.
A driver was once killed by a bullet from a Lee-Enfield rifle that was fired at a target on water more than a mile away. A bullet that goes up will come down with enough force to inflict injury. Don't make the same mistake yourself. The lock will not necessarily prevent an accidental discharge. In general, trigger locks are an additional precaution for unloaded firearms.