Fear of competition leads to corruption.
That is the basis for the fedgov and all who are employed by it.

In the Fifties, there was a concerted effort to make us believe that vegetable oil was far better than lard.There were business powers trying to get rid of the Diesel lubricating oil that the Navy no longer needed after the war (Canadian Oil - Low Acid or CANOLA oil) by selling it as cooking oil.
In the early 1900's someone perfected a gin for processing hemp into high quality thread. This threatened the cotton industry, and they had the government outlaw hemp, using the unfamiliar Mexican name for it, Marijuana. Apparently a few blacks were smoking it for a cheap high, so they worked it up into a national health crisis that had to be dealt with at all cost. (Like the Wuhan Flu).
Businesses come up with these ideas and the government goes right along, if they can see a tax profit in it.

"Both are just fat." Wrong.
Butter is far better for you than some chemically contrived, hydrogenated fat substitute our bodies were never evolved to process.

Try living in Colorado where the goofy Gov placed into law you cannot sell eggs, if you can find them and can afford them, but they MUST be certified cage free. What left wing nut group all of a sudden think this should be law?

Lucky me, lived near a farm and had Real Butter all my life, never tried fake butter.
But an interesting factoid is that REAL COW BUTTER is actually good for you, or a least people with O type blood, (eat right for your blood type), in moderation of course.
PS, . . Summer butter is sweet.

The best butter I ever had was the yummy stuff I skimmed from the top of the milk I got straight out of my Aunt's cow. I learned the hard way not to beat that cream too hard when it went from butter to chunks and liquid in a split second. I learned to make the best bread and the flakiest pastries and pies in her West Virginia kitchen. Margarine was never discussed there, but at home we couldn't always afford butter. Nine kids puts a damper on things like butter. For a long time we never knew which would show up on the table, depending on which was cheaper that week. The taste difference was very noticible and so was cooking with them. I will not buy margarine to this day.