What is HR's actual role in the company?

• https://www.facebook.com/groups/228217405293069/posts/1492533022194828/?comment_id=1492549145526549
• HR often won't even acknowledge whether they're taking action to address a very serious issue.
• https://www.reddit.com/r/careerguidance/comments/19bgr5s/how_does_hr_really_view_a_person_raising_a/
• 🔍 site:reddit.com/r/humanresources/ complaint