Diesel is just the latest target on the way to EV nirvana...
Even the US Gov't admits - diesel is more energy dense than all other fuels.
https://www.eia.gov/todayinenergy/detail.php?id=9991 that are currently in use today.
Energy density is the most important choice in a fuel, after you consider storage and transportability (Hydrogen is really powerful, but volatile). Diesel is exceptionally stable...and requires less energy to produce than say... a big-ass open pit lithium mine.
Even Europeans like diesel
https://www.acea.auto/fact/differences-between-diesel-and-petrol/
Net (low) and gross (high) energy content in fossil and alternative fuels.
www.engineeringtoolbox.com
Pound for pound, a diesel engine can create more TORQUE - and that's what does the work. Horsepower is just a calculation of torque vs time... great for drag races, but not really important when towing more than a bike rack....and that torque is a product of rotating mass and combustion pressures... things diesels excel at.
https://auto.howstuffworks.com/auto...city/information/horsepower-versus-torque.htm
Where it gets a little weird is emissions (if you wanna go down a deep rabbit hole, look up Leaded fuel contamination particulate matter on human behavior...)
https://theconversation.com/a-centu...-fuel-but-sold-it-for-100-years-anyway-173395
Anyhow, although particulates can affect human breathing - does Diesel Soot reach the volume in the atmosphere that exceeds other contamination sources? Say...like atomized plastic solvents, or urban pollution? How about vs. the effects of a sedentary lifestyle so popular with modern humans? How about vs. factory foods, or the unseen emissions from all the plastics in our kids, our houses, etc?
I have no idea about the questions above, but I do know that Diesel Engines are typically driven (in my circle) by independent thinking or critical thinking people who do math, not feelings, during the day. They work and build things, not destroying societies and civilizations. They construct, and they work, and they play and they just want to be left alone. Not forced to buy EVs (which are moreso harder on the total environment) or buy gasoline (which is less efficient for the work/play they do and less capable).
Diesels are good targets for regulation - and regulation itself is a goal. A good, regulated authority, whom we have to get permission from.