Horns are ABSOLUTELY used to alert you to something you need to be aware and prevent accidents all the time. Just because assholes like to misuse them doesn’t change the reasoning on why they are required on all vehicles.

Sirens are specifically useful when you are around a blind corner and an emergency vehicle is coming toward you. Or when you otherwise don’t have line of sight with the stoving lights.

Earplugs don’t descriminate they just dull your senses. Noise canceling headphones are to a lesser extent a handicap.

I suppose sirens and horns are irrelevant to you?

This is true in every state but Montana.