You knew them, you don't still know them....

People die from Carbon Monoxide poisoning all the time. Whether it's foolish idling, or improperly maintained vehicles.

The reality is an EV doesn't have this issue.

Like any vehicle, if it's freezing cold one should drive with appropriate clothing worn and more on hand. If the windows are gone in a crash, or the engine won't start, one should have a backup plan.

Or in your case cuddle with children in a van in a snowstorm after you didn't plan for, or gambled (and lost) to bad weather.