You explained very well! At first glance, it looks like using a turn signal is worthless for the person who drives, but it is very important for everyone involved... We are safer when we use it, and others are aware of our future actions! We don't have a crystal ball that we can guess where someone will go... 😂

Now that you have described your learning curve, I can guess that those who don't use blinkers are stuck in the moment of learning to drive, as they didn't progress further than that moment...