Exposure kills rapidly. People in accidents usually tend to have ripped clothes which increase their exposure to cold, and in many cases they will also have contact with fluids, which soak the remaining clothes and increase heat loss. Also in most scenarios the IV fluids will be at a much lower temperature than the core, meaning even more heat loss.
The silver blankets are simply a cheap, small, disposable way of treating or preventing hypothermia on scene. The technology involved can be searched further if wanted, but basically the material involved prevent heat loss with a much lower mass than with traditional blankets.
It’s a special material that provides wind and water resistance along with good insulation, and they are extremely lightweight, cheap to manufacture, and can be stored easily as the 6ft by 4ft blankets are stored in 1x3x2in packets.
This combo makes them incredibly useful for survival kits and medical emergencies. they aren’t used in “normal” situations because they are single-use and easy to rip.
As for why everyone gets a blanket – staying warm when injured is extremely important, especially to people in shock (a common response to emergencies).
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