What could be that bad?

The morning had been uneventful. The trucks had been checked off. Time was passing slowly. Our tones dropped, and a voice on the radio asked us to head for a house where an elderly man was "bleeding from the head". Assuming he had fallen and gotten scratched up we went to the truck and hit the remote. The bay door opened, and we drove in the direction of the call. I put my foot up on the dash of the truck and watched the trees go by. A mile down the road dispatch asked for out ETA and said he was bleeding badly. Perplexed, my partner pressed down on the gas a little more and the truck picked up speed. We arrived on scene to total chaos. I was directed to the back yard and rounded the corner, jump bag in hand, to find an elderly man lying on the ground in a pool of blood. He had a gunshot wound through his head. He was still breathing. We had no choice but to do everything for him, knowing it was futile. We scooped him up, put him in the ambulance and took off for the hospital. A helicopter had been called but the man went downhill quickly and was soon in cardiac arrest. The flight crew rode with me to the hospital ( CPR can't be done on the helicopter- there isn't room). He was pronounced dead at the hospital. This man had lived his entire life. He had seen the good and the bad. He had been through the ups and the downs life throws at you. What could have possibly been THAT bad that ending his life was the only solution? Nobody will ever know.