The Mercedes Benz marketing mavens think differently than you, that the diesels are not accepted to the same degree by American buyers as they are in Europe, where diesels account for about 60% of passenger sedan sales.

Fuel is SO expensive in Europe that diesels are very accepted as a way to lower the cost of running the car.

Americans by comparison are spoiled by what fuel costs here, and many of them drive gas guzzlers and huge SUVs and pickup trucks as though fuel was actually free.

Some US states have ultra strict emissions which diesels can't pass because of NoX, though the Bluetecs address this and will soon be legal.

Americans in general don't care much for diesel cars, believing them to be as noisy as a bucket of clacking castanets, so slow that they crawl on their hands and knees to 60 mph, and smelly and smoky.

Plus the General Motors 1970s -1980s with the 350 diesel, the disaster, gas engine that was supposed to run on diesel, was improperly engineered and tarred the diesel reputation in American cars ironically when about 75% of all Mercedes being sold in America were diesel models!

__________________
1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)