"Trans fat tastes good."
Sure does. Funny thing is, why would Wendy's burgers be any worse for me than what I cook at home? Lets see...
Beef, bread, lettuce, tomato, onions, cooking oils, potatoes, etc.
In some form or other, the average American eats those items at home more than out. I SERIOUSLY doubt this is a reaction to customer requests as some insist. If someone is fat or otherwise unhealthy, Wendy's is going to be no worse for you than Mom's cooking. Compared to my Country-fried Steak or Crawfish Etouffe, Wendy's is health food. ;-P
Trans fat doesn't taste particularly good, saturated fat does. Trans fats are used to cut corners financially--why buy butter if you can buy margarine cheaper?
Like any major burger outlet, Wendy's has to standardize. Their reputation can't get by on having a great batch of burgers one day and a lousy batch the next. So there is a good deal of food engineering put into ensuring that they all taste the same. Trans fats help because they're more stable than the raw unsaturated oils.