Butter, and "real" fats are MUCH better for you than all the hydrogenated crap pured into cheap and bad foods.
This is the thing, fats, EVEN the bad ones are healthy, you're made up of them.
Most of the problems come from being overweight, which is mostly caused by eating a fairly healthy diet of fat and protein but so much highly refined carbs that your body stores the fat rather than uses it for what it should be used for, turning you into a fat unhealthy blob.
THe main issue with "fats" and them being bad, is as places started making microwave food, and cheap premade meals, we saw a massive influx of the use of very very poor quality fats, and poor quality ingredients. The fats in them generally are bad, and those meals are very unhealthy and its become almost the standard diet in the UK. Then all this advice about avoiding fats came up, and people started to buy low fat premade meals, the problem was they just removed the more expensive higher quality fats, and put in more highly refined carbs and the percentage of bad fats was increased.
Thats the biggest issue, everything as a balanced diet, is pretty healthy, good fats offset the bad fats, good cholesterol offsets the bad cholesterol. When you start removing the expensive "good" fats and cholesterols, the diet isn't balanced and what was an okay amount of bad fats being balanced by other things you eat, suddenly becomes a very unhealthy level of bad fats and cholesterol.
Pretty much premade meals are the worst things you can buy and the worst thing to happen to UK health ever. But people are lazy and buying more premade microwave meals than cooking healthy meals full of good and bad things that taste great but take more than 3 minutes and a button press to make.
Doctors/government advice was horrible for years though, all you heard was fat bad, carbs, good, there was no distinction and no accurate advice being given.
I personally think the government needs to jump in to HEAVILY regulate Tesco's/Ocado/Sainsburys/the rest to prevent them offering "low fat meals" as healthy options, because when you look in the ingredients its just utter tripe, laced with a tonne of salt and sugar to make it taste passable as food.
Honestly, your average person is simply too stupid to know better, and these companies make a killing on ultra low quality food passed off as "decent" food and the long term health problems, the ever widening gut of the nation is costing the NHS billions a year, all to line the pockets of Tesco's and the others.