I'm surprised at the discussion. Not that there would be people afraid of leaving their oven on overnight, but that there would be so many.
Growing up in a Conservative Jewish home, we never adjusted the stove on the Sabbath, and I still don't. But for most of the year, we'd have a tea kettle full of water sitting on a diffuser (for ritual, not safety reasons), sitting on a flame that was turned on Friday afternoon before sundown and left on until dark on Saturday. This was the good old days, with no smoke detectors, and a pilot light on the stove that was on 24/7. I survived.
There's also a long-standing Jewish tradition of a Sabbath stew, called cholent, which would start cooking Friday afternoon, and continue cooking overnight, to be ready for Sabbath luncheon. We weren't much into cholent and, to be honest, I don't remember what we did for warm meals, though I wouldn't be surprised if at least at times, the oven was left on overnight with tightly wrapped food.
Modern ovens often have a 12-hour automatic shut-off for safety reasons. But cholent is such a big deal that you can get high-end ovens with a Sabbath mode, which (among other things), disables the 12-hour shutoff, since it would be a pretty poor lunch if the oven turned off around 3 or 4 AM. While it's true that this would normally cook at a low temperature (typically 170-200 F), I think it's clear that the manufacturer believes it's ok to allow the oven to run overnight.