It is all about assumed risk, and the reality is that your greatest risk to your health and life, is your travel from your house to the WDW park - any walking or travel by car are much bigger risk then waiting outside a WDW gate for entry. And do not think with your safe driving and other personal measures you can eliminate those risks - yes you can to some degree, but greater is risk is from others around you (other cars for example) and completely unforeseen unpredictable events. We assume greater risks to us every day then we realize and they are much higher or likely then any terrorist attack or random attack of violence as threats to your life and health.