I am going to take the different approach on this. I do think they are more dangerous than a regular car.
Yes, they can be very safe when driven by a highly skilled operator who is always paying attention. However driving on the street is not always that way. How many "other" drivers pull up to you and are staring at your car, not paying attention to what they are doing. On the older Vipers, there is no Antilock, no traction control, and not alot of other creature comforts. If you are talking about a regular car for normal day to day driving, there isn't even a darn cup holder. Of course you can either not drink it or do what I have seen several morons do and just put it between their legs while they try to shift and brake. Also it is easy to get distracted while driving, you aren't driving a toyota Corolla, and my old self has been flashed at least a couple of times while driving the car, pretty sure that wouldn't happen in a volvo and that could cause you to lose focus.
Anyone who is going to seriously say that driving a 600HP car is safer than driving a 200HP car is just wrong. It is like the motorcycle guys that say they have been riding for 30 years and riding without a helmet is safer. It isn't.
The question is really, are you going to be safe in your Viper. I can tell you I don't drive my car in the rain, I don't get on it at all going around corners. And I generally try to be a very safe and concious driver. I have 1600+HP in my Viper so things happen much quicker than a 600HP Viper.