Way, way, way more shootings turkey hunting in the past 30 years from someone shooting a hunter calling not even using decoys. Turkey hunting is THE most dangerous hunting we have when it comes to hunting 'accidents'. Birds gobbling, hunters coming to that bird from all directions, in full camo... it's a recipie for disaster if the gunner is not extremely careful. Heck, I had a trespasser following birds I was calling in a couple years ago shoot directly toward me and my guests. Fortunately, he was about 100 yards away when he shot, so no one was injured. I'm not saying that fanning doesn't increase the risk of someone getting shot... it probably does exponentially. But it hasn't been a fad for very long, therefore not as many accidents involving their use.
It's so dangerous, I won't even allow my friends to hunt separately from me. No way I'm taking a chance on my friends shooting one another accidentally.
Oh, I did see a pretty cool umbrella that had a giant turkey on it. Might come in handy turkey hunting during a rainstorm. But the $100 pricetag made me realize I'd rather just get rained on.