Just musing out loud...
I wonder if the airline's (collectively not just Virgin) bean counters had been on board enroute to the World Bean Counter's AGM in ADL, and had all had to go through the experience, including the BRACE, BRACE, BRACE; would they continue to advocate minimalist legal fuel "because statistically you'll just carry it for the sake of carrying it"?
Or would the experience, actually having some fear of the outcome, change their statistical outlook to permit the sensible carriage of an alternate, whether the current rules require it or not?
Hmmmm.