People Who Don't Signal

I would like to preface the following post by noting that there are situations in which it is okay to turn or change lines without signalling, but I will not waste my time on the obvious.

There are times when you are attempting to make a turn, let's say, a left. You are clear on the right- no cars are headed towards you from that direction. The only thing stopping you from turning is a car headed at you from the left. "Alright, I'll just wait a few seconds until this car passes." The car is not utilizing its factory-default blinkers. Suddenly, the car turns. You are infuriated. You could have already made the turn and been well on the way towards your destination, but alas you are not. All because some ingrate did not use his blinker. You have been victimized by the ones we call jots.

It is despicable. This is even worse if the jot's actions have destroyed your window of opportunity and you are stuck waiting even longer.

They must be stopped.