I beg to differ - have you ever relied on fur to keep you warm and safe? Fur bearing animals make it through arctic winters just fine, because fur is a terrific insulator. Synthetic insulators are great, however there are no alternatives that perform as well as down or fur - at least I haven't found any.
I dabble a bit in this stuff, I make extreme cold protection products for people that work outside in Arctic conditions, hats and mitts that can protect to -60. Fur, skins, wool, and down are the only materials that perform in this arena -- there are no synthetic options that I know of.
I understand there are many who think that fur is evil and I can appreciate and respect their point of view. Unless they hypocritically chicken McNuggets, striploins, bacon, eggs, or even a glass of milk. The animals exploited for those pleasures suffer considerably more than the coyote that trims a Canada goose jacket.