Hmmm. You are the only person I've ever heard of who would try to make such a comment support your contention. Most of the world lives where the ambient temp is a lot lower than that for much of the year. And I'll bet that the ambient temperature is less than that at night, and I'll bet that you don't spend every night of your life at home. Water heaters run, furnaces run, and they run whether anyone is home or not. Properly cared for and maintained, they don't cause fires. Kitchen appliances plugged into GFI outlets don't either. 99% of all home fires are due to human carelessness or stupidity or kids playing with matches and lighters, some to faulty wiring, almost never to low power appliances.
I've heard of toaster ovens causing fires, even when not being used, so ours remains unplugged when not in use. These days we don't crock pot much because that was something we always did when we both worked. It was used maybe once every two weeks for 20 years. It still works fine now, even though it has been to the Bahamas and back, and I wouldn't hesitate to let it cook unattended. There is reasonable caution and then there is paranoia. I like to take the reasonable route.