several random points...
1988 Porsche 944 Turbo was the first car with standard passenger airbags. Also, the Mercedes S class is a luxury sedan.
Cars that you don't NEED to push to their limits for everyday driving are both safer and more fun to drive if you do so responsibly. If you feel otherwise, you don't get it and never will.
You can definitely avoid an accident in a Porsche with much greater ease than in a Ford SUV, honda econobox, or volvo (on dry roads at least, heh). If you are driving within reason, you are much LESS likely to kill someone if you're in a sports car, as a simple matter of physics.
Just because you don't need a capability 99% of the time, does not mean that you won't REALLY wish you had it the 1% of the time that is the exception (think smoke detectors, snow blowers - depending on your area, 1GB of RAM, etc...it holds for these just as well as massive acceleration, awesome handling, or towing/offroad capability).
There are times when it is legal to use this power to its fullest if that's your desire...think open highway in Montana or Italy or Germany, or a closed track. If you are not in one of these situations, the aforementioned arguments still hold.
Frankly, sports cars are asthetically pleasing both to look at, and to drive (road sense, feeling of taut control, effortless acceleration, engine note)
I don't see the point of the insurance argument, so I'm not touching it.
And lastly, can't accelerate fast cuz it's a "display of speed"? That's a new one on me, I don't think I've ever heard of something like that unless you don't have control of the vehicle when you do it...