There are tons of great diesel all over the world that we could get here (as in, the chassis is sold here with gas engines) if it weren't for the EPA regs being so stiff here. Heck, most manufacturers won't even bother with a given vehicle if they can't sell it in the California states...volumes for diesel are low enough as it is, taking an extra chunk out of those sales makes it not worthwhile. So, we continue being deprived of vehicle options to protect ourselves...from ourselves. You know, smog kills!
If you want to make a statement, buy a new diesel that IS available. Slim pickin' in that field, but the only thing that speaks to OEMs trying to justify expenses associated with continuing to bring diesels to the states is $ale$ volume$.
Bryce