There is no such thing as too cold. There is only under dressed. At least that's what the old fucks say. I like me a toasty summer but that doesn't make it any less true thst its easier to get warm when your cold than it is to get cool when your too hot.
Something tells me you've never experienced negative degree weather. You can dress warm, but that only goes so far until you freeze to death. Yes I get it it's uncomfortable to be warm, but if you go inside, go for a swim, or find some shade, you will survive. You cannot survive extreme cold without specialized gear plus shelter and that's barely surviving without burning resources for heat.
You have just proven you have never been anywhere actually cold, at least not with adequate clothing. What temperature do you suppose people just magically start freezing to death regardless of their clothing?
I live in Maine, the state with the most power outages in the US. 6 months out of the year I have to pay for heat to live and whenever we get a winter storm it's likely to knock out power for a week for anyone in the boonies. I know how fucking quick cold turns deadly without gear and resources. A lot of people take heat and power for granted.
I've worked outside in -50 with a 30km/h wind, more than once. It's not fun, but I would take that in a heartbeat to +40. I can dress for -50; at +40 there's only so many clothes I can take off before I get arrested.
And I've worked in sweltering heat with high humidity and it's a lot easier for a layman to survive the heat than the cold. You need gear and burning resouces to survive the cold. All you need with the heat is some shade and maybe a dip in the river/lake/pool. Like I said in my other comment, there's a reason homeless flock to warm climates. It's easier to survive.