Used to fly in SoCal and enjoyed the freedom of flying in America. In Europe the mentality seem to be; we keep it safe by keeping 'em all on the ground. America quite the opposite, and I do agree that keeping the airspace so open and free comes with risks. Where do you draw the line?
As much as I agree with common sense - if all these incidents occurred 'legally' isn't the airspace constructed with too small margins? How about all the VFR Citations, King Airs etc. transiting above the Bravo VFR between 10k and 18k?