I must admit, I have never lived in rural Denmark, but have lived in rural Wales, so know that a car is an absolute necessity when living rurally.
I'm not sure how the costs balance out - rent is cheaper rurally, but then jobs pay less / aren't so easy to find etc.
We are lucky, we saved up for ages to buy one of these to cart the children / bulk shopping about which has been an absolute godsend (we can't afford a car but live in the city so lots of public transport etc).
I do think this fat tax is a bit stupid though. It would make sense to tax sugar instead if done for health concerns (but as a self-confessed chocoholic I'm glad they didn't
)
Having said that, reading the stuff that has been written about it so far, the idea isn't so much to encourage people to buy artificially low fat alternatives, but to use different oils instead, olive oil, linseed oil, coconut oil etc for cooking. Plus, while it is an extra tax, it is only a few kroner more it comes out as (so not like a 200% tax) and the supermarkets still seem to be running offers on butter etc this week, so it's the usual case of keeping an eye on which supermarkets run which offers to get butter a bit cheaper.