Hello Andrew,
     You mean there's another reason that driving is 
  risky? Isn't that why people buy car insurance? Futures trading is 
  most certainly riskier than stocks, theoretically. First, futures trading 
  is a zero sum game. Secondly, futures have expiration dates. You never 
  have to worry about taking delivery of live cattle when trading stocks. 
  Thirdly, it's a mathematical fact that leverage increases risk. If you have an 
  account fully invested at a leverage of 10 to 1, then a 10% move against you 
  in the underlying wipes you out. They same account trading with no leverage 
  would require a 100% move against you to wipe you out. From a probability 
  standpoint, which is more likely to happen, a 10% move or a 100% move? Please 
  correct me if I'm wrong with my math here as certainly wouldn't be the 
  first time. Of course, someone trading the leveraged account would 
  compensate for the increased risk by trading fewer 
  contracts. In stocks, most people don't trade with leverage. If they do, 
  it's by choice. Plus, they must get approval and there are limits to the 
  amount of margin. However, in futures everyone is leveraged. Therefore, 
  futures trading, from a leverage stand point is most certainly more risky 
  than non-leveraged stock trading.  As you pointed out, there 
  are measures one can take to limit the risk: position sizing, stops, spreads, 
  options, close trade prior to delivery, etc. Risk management is 
  key.
      Back to the original question. One thing I do for any 
  market I trade is go back through the entire history and measure the 
  following.
          
  1. Series of runs. That is, how many 
  times has the market gone up/down X number of days/weeks/months in a 
  row. Starting at 1 up to the maximum.
          
  2. The maximum move up/dn in a day, 
  week, month. Do this as a percentage and in dollars.
          
  3. For markets with daily 
  limits, measure the number of limit moves and then measure how many 
  times the market has made limit moves in row up/dn. What was 
  the dollar value the percentage move each 
  time.
  Use 
  all these values and measures as risk proxies, keeping in mind that those 
  extreme, rare values most certainly will be exceeded at some point in the 
  future. Make sure you and your account can handles these possibilities. I hope 
  this helps.
  Trey