So often people like to take the ambiguous, complex aspects of reality and attempt to make them black and white in their heads. This can lead to many problems as this constructs mental misrepresentations of reality and thus they are unable to properly deal with things as they really are. This goes back to the problem of one not dealing with reality as it really is and the problems that stem from that.
'The psychic task which a person can and must set for himself, is not to feel secure, but to be able to tolerate insecurity, without panic and undue fear.' -Erich Fromm The Sane Society p. 174.