As much as you try to mandate safety into flying, there will still be accidents. TCAS is great for airliners and class B airspace, but in podunk county it is still unnecessary. There are still lots of GA airplanes flying around with only rudimentary instruments or even no electrical systems at all. The responsible pilots should not be required to pay the price for substandard performance. The Colgan and Comair aircraft had all the bells and whistles, yet still managed to kill more people than GA accidents do.