foolish to play in the BC without the right tools.
if you ride in the backcountry (one hour + from life sustaining care like a hospital or even a ski area patrol office with an AED) without the appropriate safety gear frankly you deserve whatever you get.
if you didn't bring appropriate sleeping bags, pants, jackets, food, insulation, etc. you would die of hypothermia for sure - and it is what you should expect to happen.
you may not expect to be involved with an avalanche, but if it happens in a BC situation you BETTER have the right gear - or someone is probably going to die that day. are you willing to take that kind of risk with your life? with your friends?
i have memories of friends that have died in the mountains. do you?
if there is an REI you can just buy one and return it when you're done with the trip if you can't find a place that rents.