“Because only an idiot would leave their car running when they went in a store.”
What possible reason is there to leave a car running when you are away from it other than to have it stolen?
Insurance will cover the theft of a vehicle even if you leave the keys in an unattended car. I know this for certain.
To keep it cool. Or warm.
“What possible reason is there to leave a car running when you are away from it other than to have it stolen?”
Remote start to cool it down or warm it up, or to keep it cool or warm.
No key involved at all.