He certainly should accept it was his choice to break the law...but I don't think he is saying, "hey they did it too" when pointing at the ships and planes not having DPFs and such. Instead, I think he is saying, "look at all the pollution being produced to reduce pollution" and in doing so is expressing frustration that he has to either go gas, go with crippled diesel, get an old diesel, or risk breaking the law to fix the problem which creates another problem (a legal one for him).
That is how I took it, so that is why I shared it in a tractor forum...for any equipment that has DPF added has it added to reduce pollution (supposedly), so I certainly hope the attempt to do so we are not producing more waste by adding more equipment, reducing lifespan, reducing fuel economy, and burning more fuel to get these products over here and put together...for if we are leaving a larger carbon footprint in doing the "cleaning," then it is just spinning wheels.
Take battery powered automobiles...if they are charged by the sun, they make sense, but if they are charged by a generator, then one is just fooling themselves to call them clean.
That's why I am glad I bought a tractor that was not required to have this stuff on it.