Glofish, sorry but statements such as "has been done in the past"... " can never be" etc are not worth much unless backed up by evidence. There are plenty of sources to refer to, try planecrashinfo.com for worldwide figures:
A sample stat is Causes of Fatal Accidents in % from 2000 to 2010 ( aircraft with 19 pax and above):
Pilot Error 34
Pilot Error Weather related 18
Pilot Error Mechanical related 5
Other Human Error 6
Weather 6
Mechanical Failure 22
Sabotage 9
Some food for thought perhaps?