Here's a personal experience, somewhat embarrassing, but...
We rented a condo in Banff which had closed garage parking underneath. I was driving a rental car that I was not familiar with, a Nissan Altima. We were leaving to hike with some friends so I had the car out of the garage. Friends decided to drive so I pulled the Altima back into the garage. I hit Push-to-Stop engine but apparently not long enough. Later that day, after about 8 hours, we returned and my friend pulled his car into the garage. He then reported to me that I had left my lights on and they looked weak. When I went out to the Altima I noticed that the daytime running lights were on and that the engine was running. Fortunately nobody was killed from carbon monoxide poisoning but that's how easy it can happen, especially with a unfamiliar car.
I find it interesting that there have been more people killed from Push-to-Start than Takata air bag inflator explosions, yet little to nothing has been done to address the Push-to-Start deaths.