I stand by you but I was not very sure and still am not.
You leave with a minimum amount of fuel as per dispatch release regulations.
This contains a certain amount of contingency that in my opinion is not intended also to be used to cover the one engine out case.
Now once airborne I am not too sure if this still stands.
For me it may have been a factor of uncertenty that may balance the scale in favour of an early landing.
Not ASAP but in accordance of proper time management , burn off etc...
ETOPS fuel planning covers this....so maybe we need some regs that do the same for the non twins in civil ops.