It IS scientific to approach it backwards.

Look at how the Intelligence agencies handle their ufo reports.
They go at it from all directions including unverifiable eye witness accounts.
About 8% remain unexplained, and even an higher amount that are "explained" but with too many variables.....they can't explain them all.
The same goes for crop circles.

You completely ignore the fact that these have been reported for centuries, and that they show up regularly in far away places (like the wheatfields of Alberta and Saskachewan) in the middle of hundreds of acres that NO ONE can get to except the farmer, and when he comes upon them, even he is confused.

You have a closed mind; you ignore the reality of the 20% that cannot be explained, and you have no education about the genuine circles except for your beliefs. End of story.