Some thoughts:
Very few biz pilots own calibrated tire pressure guages sufficient to check jet tires...fewer still check everyday prior to flight...fewer still would have checked prior to a flight at midnight, as such was the Lear 60 departure time. Few pilots would have actualy given more then a cursory look at thier tires in the dark, with a flashlight, much less gotten on their hands and knees to check tire pressures.....
Fewer still are pilots that actualy know what the rated tire pressure is for thier aircraft..fewer still are the pilots that check, know the number, and will scrub a flight at midnight because no nitrogen is available at that time to pump them up...
If I sound like a broken record, my apologies...just another rant about professional responsibility....