I'll play.
1) there's no "good fats" or "bad fats", just food that are nutrient rich/poor, foods that are calorie dense/sparse and foods that are processed or not.
2) the "fat tax" shouldn't necessarily have anything to do with the fat content of foods, though they may be more prevalent on a list of taxed foods because they are inherently more calorie dense (9cal Vs 4cal)
3) avocados are OK because although they are calorie dense they are also naturally nutrient dense (ie, they're not "fortified" nor do they have any artificially added nutrients via processing means) and they are not processed.
lets go again.