Nothing wrong with questions at all,, its the answers from the inexperienced that cause problems.
Making a carte blanche statement such as,, "NEVER USE THE REAR BRAKE!" is misleading and could be dangerous.
The rear brake,, like every other feature on a bike is a tool,, and I think there is some old saying "Right tool for the job??"
There are a bunch of reasons and situations where the use of this particular tool can be particularly effective and keep you out of trouble(or the front end of a buick)
rear brake use is just another tool for your toolbox of riding skills.
Having the right tools/skills and the knowledge/experience to use them just makes you better and more safe than the rider that doesn't
Yes, there are many racers(some that have won world championships) that say they don't use it,, but that doesn't mean they don't know how.