I find it interesting that employees are expected to 'investigate' and 'report.'
Too often, poor management is one of the causes of accidents. Lack of training, failure to provide or maintain equipment, etc often play a role.
Yet, the employee who even hints at having an opinion about anything- even the weather- is considered a "troublemaker." Not good for your career, I'd say.
The result of this is predictable....I have seen "accident investigations" that had almost nothing to say about the accident, but went on for pages, using only innuendo and vague assertions, to "proove" the injured person just wasn't a nice guy!