When my ex and I first got together she was known to have left a stove burner on a few times. Well, I fixed that. I painted the "off" setting on the burner knobs red. Now that she is gone and we are divorced I've found out this works perfectly. It keeps me from leaving the burners on. How could I have known?
Your neural network associates red with off due to that event and acts as an aide-memoire or mnemonic.
You could have known if you realised that's how memory will affect your future self.
Red can mean off or stop, or many things. I used red because I can see it from a distance without running over to the stove.