I hate to say this, but they've been so thoroughly debunked that it's painful to see anyone think they're anything besides the pranks they are.
Actually, you are wrong on this regard. One can easily document a handful of cases to people carrying out a hoax. However, while one can explain how a human could create such, it has been demonstratably obvious that it would be rather impossible to put together such in a single night using only simple tools and handful of conspirators, such as would have to happen in order to explain said circles. A "rational explanation" is not the end of the phenomena. Crop circles are a sign of intelligence, but not human in origin.