The SIP and Safety Committee actions are within MIL Rules and Regulations and have been consistent with what you wrote. Suspension is recommended for Serious accidents when the employee caused the accident by not following the safety rules. A written warning is given when an employee caused a Moderate accident by not following the safety rules.
On the other hand, a suspension is Not recommended for Serious accidents when an employee doesn't violate a safety rule, for example, an employee trips on a curb while walking to the canteen and fractures their arm.