What we need to admit to, even though we don't want to, is there is tragedy in life. It happens, whether we or a loved one are hit by a falling boulder, or shot by someone that has snapped. Nothing we can do can keep these things from happening in the future. Nothing, unless we wish to confine ourselves and our loved ones inside 4 walls from now until eternity. And what kind of life would that be? Even then disease can strike, a tornado, etc. And the odds are actually in our favor that none of the above will happen. What we can do is cherish life and each and every day we have with all those around us and teach our young to do the same, then if those odds of tragedy does indeed strike, we can rest with a small amount of peace that we did not waste time on what really didn't matter in the larger scheme of things.