The Daily Paragraph -- Could We All Please Agree to Use Our Turn Signals?

At times of heavy traffic, I actively dislike driving north on Diamond Street across its intersection with Bosworth. The Glen Park BART station sits on the southeast corner of the crossing leading to an effectively endless stream of idlers and slow pokes, including pedestrians, commuter buses, taxis, Ubers, Lyfts, and various other vehicles that clog up the crosswalks and curbs.  A general absence of city planning resulted in two de facto lanes of traffic leading into the intersection in that direction. Neither lane has a legally-assigned role, but as you might expect, the cars planning to turn one way or the other onto Bosworth tend to favor the lane corresponding to the direction of their turn. Unfortunately, there is always enough oncoming traffic to slow down the left-turners and enough pedestrian traffic to slow down the right-turners. I almost always want to go straight. Picking a lane is invariably a coin-flip for me. It's frustrating enough to endure the delays imposed by poor lane selection, the least my fellow drivers can do is give me a heads-up about their plans. We will all get where we want to go a lot faster if we work together, damn it! Today, the driver in front of me decided to play a game with me. We were stopped at the light, both of us in the left lane. Numbers one and two in line to enter the intersection, neither of us giving any indication of plans to turn. I thought I would get a pleasantly unimpeded trip across Bosworth once the light changed. Nope! The green light lit up, and so on blinked the left turn signal on the car in front of me. Aggh! Why? I would have preferred that the little turd turn left without signalling at all. People who do that are at least committed narcissists or assholes. If you wait until the green light to turn on your signal, you suggest that you really just don't understand what it's there for, but you think you do. That makes you an idiot, and idiots are dangerous. You can predict what an asshole will do, but not an idiot. So here's my request...don't be an idiot. Use your turn signal, and do it in time to be helpful. Thanks.