An extremely naive feeling that may be conceptualized as: we can do anything. At the same time this is something like self-confidence, or self-esteem. For the most part, that is healthy thing and a healthy attitude.
There is a lot of self-confidence but there is not enough self-confidence, self-esteem or skill to really investigate and see all sides of a situation.
The U. S. operation in Iraq, commanded by G. W. Bush, is believed, by many(1), to have been flawed. The earlier "concept," that of self-esteem or self-confidence, has now "mutated" (morphed) into arrogance or folly.
(1) incl. Bush himself, in retrospect