While theoretically that may sound logical, there are many barriers that (often) come from social conditioning. Say you want to do xxx but society tells you that it is unrealistic and a waste of time and energy. Consequently, one doesn't want to become a fool and sits on the fence, waiting to garner evidence and support before taking action.
(which doesn't work out of course, because experiencing things yourself is probably the only way you can ever truly convince yourself what is realistic and what is not)
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