If I told you that there was a poison candy in a machine with eight thousand candies in it, would you put a candy from that machine in your mouth and swallow it? That one candy is a known risk, just like the unpredictability of the weather is a known risk. The fact that we can't control something has implications on risk mitigation, severe implications, but I don't understand how the difference between something being "knowingly undertaken" and something you cannot control matters. If you know you can't control the weather, you could choose to mitigate the associated risk by not moving into hurricane or tornado country. All we're really talking about here is risk and risk management, but then you've already concluded that I don't understand that.