Well, a review of various websites with nutrition guidelines to help avoid heart disease shows widespread advice to avoid trans-fats. I doubt that the concerns about these fats are baseless.
I agree that it's really hard to separate out intake of trans-fats from other risk factors of human diet and behavior. It looks like there are animal models being developed to study metabolism of different fat sources and effects on incorporation into cell membranes, blood lipid profiles, etc. Hopefully those will help sort out our understanding of how these and other fats behave in the body.
Meanwhile, I see nothing wrong with recommendations to avoid intake of trans-fats and mandatory labeling. Most foods containing trans-fats are junk food anyway, not to mention that the trans-fats contained in those foods can easily be replaced with fats of less concern. I would rather know that there is evidence linking these fats to heart disease, so I can decide what I want to eat and influence my own family to eat. I don't really care what other people eat.
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