We have seen people ATTEMPT to copy formations that were made by someone or something, but they have never been able to duplicate that which has been found in authentic crop circle formations.
The REAL ones are created in such a way that the crops have not been damaged. The are bent at 90 degree angles and weaved together. Faked formations ALWAYS exhibit damage and breaking to the crops, and are not weaved.
And yes, not one hoaxer has been able to duplicate the precision of the real thing...
Dream on brother. Your impeccable "logic" will build bridges and buildings......But not all crop circles. You assert that people must be the most simple explanation. I don't buy this. Not yet by a long shot.
Crop circle near busy motor way with Stonehenge near the top

http://www.circlemakers.org/exhibit_a.html
Good info at this link>http://news.nationalgeographic.com/news/2002/08/0801_020801_cropcircles.htmlMovie Mistakes
In the Disney movie Signs, the circle formation is found in the middle of a corn field. In reality, corn is not the best medium for crop formations and very few are found in corn fields. When the movie's producers came to England to consult with circle experts, they were told the circles were made in fields of corn. To a European, corn covers all the cereal cropswheat, barley, oat, and so on. To Americans, corn means only maize. Hence the error.