Demonised? Really, I don’t see it.
Less preferred by the market, definitely.
“Dieselgate” accelerated the inevitable. Too many diesels were being used for use cases which make little or zero sense for a diesel, ie short duration, short distance, low speed, below operating temperature, etc. As a result they weren’t as a reliable or cost effective to run as those people hoped, especially with the additional kit required to clean up local emissions.
Diesel is still top of the tree for those people who really do tow a twin axle caravan to Morocco twice every week, etc. Not so much the vast majority of people who in reality do low-single digit thousand miles per year, driving to school, work. supermarkets, and the tip occasionally, counting MOTs and repairs as services.
The people who I know who are most negatively vocal about diesels are those who have had to meet the cost of several hefty repair bills. Without exception they shouldn’t have bought a diesel. That’s not “diesel’s” fault, nor are those people demonising diesels, they just don’t want to get bitten again. Their view is as valid as yours and mine.
Your comments in your post below made me think that (a) these green levies would be significant and (b) that you’d know how much they are, or else why would you make such a bold and negative statement?