Butter is perfectly fine to eat, and people should stop worrying about it. On a piece of buttered toast with jam, the butter is the healthiest ingredient. Definitely stay away from all the various disgusting fake-butter products, even if they now have stopped filling it with trans fats. It’s not something I would want to do, but eating pure butter would be way healthier than eating oreos.
Cooking stuff in butter (or ghee, or lard, or duck fat, or beef tallow, etc.) is better for you than cooking with rapeseed oil or whatever alternative, as well as being more delicious. Just don’t burn it.
People should reduce the soda, fruit juice, cookies, chips, pasta, rice, bread, mashed potatoes, etc. in their diet before they start worrying about butter.
People should also stop worrying about the cholesterol in eggs, sodium, reasonable amounts of meat (though they should probably eat more skin, connective tissue, bone marrow, organ meat, etc.), and so on.
Overall, everyone would probably benefit from eating more vegetables though.
