 If one for example was to commit a murder but could't remember the face of their future victim, then this type of ignorance can actually be considered good, so that, for those predisposed towards evil, ignorance is preferable than knowledge.If knowledge is partial, and is not a part of wisdom, which includes where and how this knowledge is to be practiced, then it can be dangerous.The orators then who go around Athens encouraging its citizens towards or against war, and to the degree they cannot describe the precise length or ideal location of this war, are acting as fools despite being knowledgeable in war's theories.