In my experience the stereotype is well deserved. I have in the past reported impropriety during a company conference, and specified I was doing it to make sure

In my experience the stereotype is well deserved. I have in the past reported impropriety during a company conference, and specified I was doing it to make sure people were advised to knock it off and avoid getting ourselves a Uber style scandal, I was put on probation right away (the CTO was involved) and I had to leave the company right after that. It wasn't worth to sue them and frankly the job sucked, but that taught me the valuable lesson that even if you're looking out for the business, HR is still not your ally. HR serves executives and nobody else.