WIY…
You are absolutely correct, BUT…
Not signaling is the least of the terrible driving infractions I see all the time.
One of the worst is making illegal U-turns in the middle of busy streets.
Not only is this illegal, not only is it a chilul HaSh-m as people doing it keep people waiting in BOTH directions while they take several back and forth maneuvers to complete the turn, but it is extremely dangerous! A friend of mine was KILLED a few months ago making such a U-turn when he apparently didn’t see someone racing down the street, and they apparently didn’t realize he was pulling out to make the U.
So… all of you out there who don’t care about the law, who don’t care about chilul HaSh-m, HOW do you feel about leaving a young widow and fatherless children?!?!?