Margarine only gained popularity because of the sentiment that butter was bad! And margarine is barely relevant any more, since it's widely understood that trans fats are bad.
I'm in Germany, and I currently struggle to come up with anyone who doesn't use margarine. I haven't heard the transfat angle mentioned yet in relation to margarine, so I had a quick look. Apparently margarine in the EU contains about 1-2% of transfats, which is within the limit that the EU will enforce starting next year (2% transfat per fat).