Turn signals

Is it laziness or poor driving that prevents a vast majority of drivers from using their turn signals? In case anyone is curious it is for the particular benefit of people behind you (don't assume you see everyone) who plan their defensive driving moves way in advance---like bikers! (Motorcyclists and bicyclist.) Think of someone else and be safe. It could be you---or your brother, sister, mother, father, daughter, son---one day who will be thankful, that you or someone else used them.