If some requirement are regarded as safety attribute, it means that in-achievement of safety requirement leads to threaten safety.
The rationale is explained in the somewhere. I believe that system FTA or system FMEA are proper means of why they are born.
After they are identified, safety engineers shall suggest methods how to handle them. Their suggestions are called safety mechanisms in ISO standard.
Sometimes, engineers forget this simple principle. So non-safety related requirements are mis-perceived as safety requirements.
All safety requirements have birth-registered? Unregistered has a potential to threat safety. Don’t forget to register. It is natural like happened in our society.