[dennisw]

3 - I have proof, the proof is the numerous films of people actually making crop circles.
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SOME PROOF! They make crop circles that are quickly seen as "off" and not as good as the real thing. The real thing that no one seems to take credit for.

[discostu]

They make crop circles. That's where you can stop. We have seen PEOPLE make crop circles. Therefore it is entirely within the realm of possibility for PEOPLE to make crop circles. Therefore in order for us to accept that some crop circles are not made by PEOPLE you need evidence to put it outside the realm of possibility.

The simplest answer is the most likely. That's is the religion of logic. Until you stack up extra ordinary evidence that moves the activity up in complexity past the current simplest answer there is no reason for any person using logic to assess the situation to not assume they're made by people.