So basically, if you fly a piston fixed wing in cold weather you are risking your life, is this the case?
You risk your life getting out of bed every morning, if you managed to survive the night. No one gets out alive, when it comes to living. The secret to prolonging your time on Earth is to be able to identify the risks and mitigate as much danger out of them as you can while still enjoying life. Cold weather flying is not any more dangerous than warm weather flying as long as you know how to deal with the situations unique to the climate you are in.