MY MITSUBISHI OUTLANDER SPORT HAS A KEYLESS START. THERE IS NO MECHANISM THAT PREVENTS THE VEHICLE ACCIDENTALLY BEING TURNED OFF WHILE STILL IN DRIVE OR REVERSE. ON 5/30/19 AT APPROXIMATELY 9:20 PM, I MADE A RUN TO MY LOCAL RITE-AID. I TURNED OF THE IGNITION, BUT FORGOT TO PUT IT IN PARK. I EXITED THE STORE AFTER APPROXIMATELY 5 MINUTES TO FIND MY CAR MISSING FROM THE PARKING LOT. I INITIALLY THOUGHT IT HAD BEEN STOLEN. THE POLICE FOUND MY VEHICLE AFTER IT HAD ROLLED OUT OF THE PARKING LOT, INTO TRAFFIC AND ENDED UP CRASHING IN A DITCH. IT HAD TO BE HAULED OUT AND SUSTAINED SIGNIFICANT DAMAGE AND MAY BE A TOTAL LOSS. I CAN ONLY BE GRATEFUL THAT IT DID NOT COLLIDE INTO ANOTHER VEHICLE,L OR HIT A PEDESTRIAN. THIS ACCIDENT COULD HAVE EASILY KILLED SOMEONE. THERE IS NO LOGICAL REASON THAT A SAFETY MECHANISM SHOULD NOT BE A STANDARD REQUIREMENT IN ALL PUSH BUTTON START VEHICLES TO PREVENT SUCH A TRAGEDY. THE CAR RENTAL I AM CURRENTLY USING IS A 2019 ESCALADE. I TESTED THE REMOTE START IN THE ESCALADE AND NO MATTER WHAT GEAR I AM IN WHEN I SHUT OFF THE ENGINE, IT AUTOMATICALLY DEFAULTS TO PARK. IT CAN BE DONE AND SHOULD BE REQUIRED!