Not everybody is out there shooting to be a combat shooter, or shooting for self defense training. Lots of people go out to target shoot. And only target shoot ... Not everybody shoots for the same reason.
And this is one of many reasons why I don't give shooting advise at the range unless they ask.
I often see fathers spending time with their young kids shooting at the range. Yes, it's often obvious the fathers are not proficient with firearms, but am I going to "interfere" with their quality time together? Heck no. For me, I think it's the value of time spent with your kids, not how accurate the shot groups were. Especially when you can see that the kids are having a great time shooting with their dad. Same goes for husband/wife and boyfriend/girlfriend.
I also see many shy, obviously first gun experience shooters having enough problem coping with the loud noise of the gun fire (fortunately, the range staff do a great job of providing hands-on orientation for these cases) and allow them to experience their shooting experience. Once they get more comfortable and become aware of other shooters and their shot groups, they usually seek out information.
One time, a wife of a shooter in the next lane saw my shot groups and asked if I could give her some pointers. With her husband's approval, I ran through the basics of stance/grip/sight/trigger control. When she began to out shoot her husband (she got tight 2 inch groups at 7 yards when her husband was all over the place on a full size target), he got visibly upset and wanted to leave the range. Imagine if you were in his shoes and the discussion they would have on the drive home - "Honey, nothing personal but you suck at shooting"
Of course, if I saw something unsafe or imminently dangerous, I would intervene. For the most part, I just focus on my shooting objectives (testing loads or practicing drills). Now, if I saw someone who was obviously shooting better than me, you can bet I will be having a chat with him/her. I am always open to advise/techniques that is working for someone else and almost every time, they are happy to share what is working for them.