The problems arise when one confuses and mixes up one's essential-self with the paraphernalia of one's desires.

No one acts without the expectation of desired results. Who will engage in actions towards a goal that is known to unachievable?
Again, the problems arise when people incorrectly impose their fantasy lives upon objective reality.
"I want" overwhelms "I know" and "I know" is mistaken for "I feel".
Some live in fear of snakes in the grass, when the reality is simply that they are looking at lost lanyards on the lawn.

When one is motivated to save children from being eaten by their democratic neighbors, no action is likely to solve the imagined but not-real problem. Those living in delusion can never see through the illusions of their their own discomforted minds and thus never achieve piece of mind, heart and being.