The technology for computers has grown drastically over the couple of decades but speaking from personal experiences (ATC and computer programming), computers cannot "think" or compute the amount they need to, to actually be a 100% safe. Anyone can notice this!! Have you ever installed or downloaded a program that never needed an update or patch? Computers could possibly do this but the fact that a machine which does NOT think and runs by rules and limitations is going to have the responsibility of thousands of lives a day including mine and yours, makes me rather whip out my bicycle.
Heaven help us if they're going to run Microsoft!?!
G