I've done more than just read about crop circles - I've actually investigated two (The Angel circle and the Big [supposed 666 ft] circle) that appeared in 2001 on the outskirts of Cambridge UK where I live. As a result of my conclusions, I'm appalled by the gulliblity of people who believe these particular circles originated from mysterious or extraterrestial sources. I'm also very dissapointed that investigators in this field somehow ascribe themselves (or get acribed to themselves by others) the label of being an "expert" when if fact their "skills" often amount to nothing more than being a 'regular visitor to circles'.
That "possessing a powerful enough belief often leads to proof" - well, this can actually cloud ones technical judgement and assesment on matters and lead one up the garden path the wrong way rather than the right way. Belief only serves to maintain an interest in something, but has no part in the process of proving that something is right or wrong.