You're correct about it being something that wasn't said from day one. That being said, I still say that they had no solid arguments at the beginning. Being against something doesn't mean they have a specific plan in place to do something. That was my point. It was all generalizations. That's common with any new movement though.
All you have to do is watch an interview with Ron Paul. They're all over the internet, but I would be happy to link some if you can't find them.