Blanket statements about a department, generation, brand, race, OCI interval, etc etc. are untrue and at best anecdotal.
My wife works for a public utility and has had positive experiences with HR although no conflicts were involved. She has seen HR deal with problem employees appropriately from high level management to entry level.
A friend in healthcare could not get HR to deal with subordinates in a reasonable manner who were not doing their jobs or causing problems with other employees, he left and started his own business. Just the opposite of the general tone of replies.
The small company I work for has an HR department of one, the CPA is also the HR person. She's not trained in HR, it was dumped on her when the previous HR person retired. The company historically doesn't deal with conflicts or substandard performance issues very well, stemming from the original founder's aversion to conflict with others. The joke is you can't get fired.
Every company is different, only the OP knows how his HR functions.