People don't use turn signals because...

Yup.

When I first responded to this thread, it was in IMHO. If the OP had opened the thread in the Pit, then I probably would have refrained from responding at all because I would have known in advance the OP sought a bitch session instead of a poll or a desire for gaining a better understanding of human behavior. In hindsight, as soon as the thread was moved to the Pit, I should have abandoned it instead of getting sucked into defending against ad homenim attacks and strawmen.

No more traffic threads for me, regardless of the forum, unless I don’t engage in offending driving practice that is the subject of the thread. If the thread is started as a valid pursuit of knowledge in some other forum, I can just wait; surely it will end up in the Pit where I can just sit on my perch and throw stones at anyone who admitted engaging in the offending behavior.

I guess fighting ignorance sometimes must yield to a mod’s desire to berate a poster for doing something IRL the mod doesn’t like.

Thanks to all who came to my defense.