If I stopped and scolded somebody every time I seen roundabout violation I wouldn't get pass two roundabout.
What amazes me people will stop at yield sign and run stop sign. Some see car half way around the round about they will stop. When the car turns and exit before (usually not using blinker light) they stuck holding up traffic. Then there are the ones that enter in the left lane swerve into the right lane back into the left lane and exit the first exit then swerve back the right lane. Course during this meander they don't use blinker light.
That is why I never enter, go through, or exit roundabout with car on either side of me. You just don't know what the going to do?