As has been mentioned previously, it is a flight manual requirement for all three trims to be run through FULL deflection checking for free movement and lack of binding etc.
it is extremely conceivable that a distraction occurred resulting in a failure to reset the rudder trim during this check, it’s happened to me before too. The rudder is also the last of the three trims to be checked.
But I did (thankfully) pick up my error during the before take off checklist. So I do understand, especially on a busy morning, if you were under time pressure, fatigued, etc how this could happen. It is tragic, but I guess avoidable also.