You are drawing some very faulty conclusions. Perhaps in Huston, they have train horns but not here, perhaps in Hustioon they have large vehicles lit up like Christmas, but not here. Don't assume every part of the nation is equivalent to Huston. Also, in my area, we have all-volunteer fire departments with volunteers that do not have the money or desire to highly mark their personal vehicles and they are difficult to see and hear when a siren speaker is tucked up under the grill.
I live in a part of incorporated Houston... thus our Fire brigade is all volunteer. These guys just LOVE to play with their toys! So, I have never witnessed them using stealth mode to get to an emergency! Sometimes, I wonder if they are just in a hurry to get morning donuts! LOL!
Just kidding!
And, yes, I AM doing what all of us do! Relating to my environment! So, it may be faulty in your community, but it certainly isn't here.
Frankly, I'd prefer they be extremely noisy, and the lights be extra brilliant (except where folks might be susceptible to strobe light induced seizures)
One very good way to discipline one's self to pay attention while driving is to do so in a car with a manual transmission and no radio. But, THAT's not going to happen! Peace!