[throwaway0a5e]

They don't give you a massive "hey WTF, stop doing that!" button for you to not use it in blind religious adherence to a shallow rule of thumb or misguided attempt at politeness.

People with your attitude toward horn use likely cause substantial harm to society through fender benders, delays, frustration, etc, etc.

I think I can maybe count on one hand the number of times I've had to move out of a lane lest someone merge into me. The times that situation has been prevented through horn use are innumerable. And that's just one example.