If you hit a deer at night bending your bumper and it blows a steer tire causing you to hit the guard rail. Do you think it's fair for your company to charge you with a preventable accident?
Not quite enough information to determine:
Visibility conditions, night yes but fog? Curve, hill or other obstructions, cleaniness of widshield?
Was speed appropriate for conditions?
Was equipment appropriate? Tires; proper inflation, tread 4/32+ (front) any cupping?
Steering linkage and suspension?
Lighting; Headlights working and proper watage, lens polished or yellowed? Could highbeam have been used at that time?
Driver's time on duty and physical condition, medications etc.
Distractions; On phone, talking to co-driver, etc?
If you got tagged with a preventable and safety did not investigate/question at least the above as a minimum, then safety just blew you off.