The official report does not support the thesis that
the main failure was the lack of fuel checks prior to departure.
It was contributory factor, but main factor was installing the improper FQI. Also being former ATR driver, acquainted with the peculiarities of ATRs electric system, I strongly believe that captain was flying the aeroplane and F/O was reading the checklist after the engines quit. Sticking maintenance noses up the fuel tanks caries a delay penalty and it's done only if the crew suspects something is wrong with fuel gauges. Not making fuel checks on the leg to Bari or checking the uplift against the FQI were mistakes that turned to be lethal but they were mistakes, not something you'd get convicted for in civilized country as
mens rea was definitively absent.
EDIT: Rephrased for clarification.