To the OP, if you think it's unhealthy, don't eat there but don't try to impose your point of view upon others. Others might eat there occasionally because it's an option - I had McDonald's last night but wouldn't have everyday. It was the quick option for that day.
I made a point earlier in this thread of saying I don't have any problem with people enjoying fast food on an occasional basis. Like all things it is fine in moderation. I also am not trying to impose my point of view on anyone. I am stating what I feel, and why I think it is important. Others are free to disagree, as some are certainly doing. I think this is a real issue, not just a matter of taste.