Cooper's meaning and usage falls outside of the definition of a [[phobia]] used by the DSM. For example, one of the DSM's diagnostic criteria of phobias is that the person be aware and acknowledge that their fear is irrational, and usually causes some kind of functional impairment.<ref name="dsm4">{{Cite book| publisher = American Psychiatric Publishing, Inc. | authorlink = http://www.psych.org | title = Diagnostic and Statistical Manual of Mental Disorders DSM-IV TR (Text Revision)| date = June 2000 | location = Arlington, VA, USA | isbn = 978-0-89042-024-9 | doi = 10.1176/appi.books.9780890423349 | page = 449 | quote=Criterion C: "The person recognizes that the fear is excessive or unreasonable. Note: In children, this feature may be absent."}}</ref> True medical phobias of firearms and other weapons can exist, but are unusual.<ref name=Ninan>{{Cite book | last1 = Ninan | last2 = Dunlop | title = Contemporary Diagnosis and Management of Anxiety Disorders | year = 2006 | publisher = Handbooks in Health Care | location = Pennsylvania | isbn = 1-931981-62-0 | pages = 107 | quote = Table 7-1 Names of Some Phobias...Unusual...Hoplophobia-fear of firearms }}</ref> | Cooper's meaning and usage falls outside of the definition of a [[phobia]] used by the DSM. For example, one of the DSM's diagnostic criteria of phobias is that the person be aware and acknowledge that their fear is irrational, and usually causes some kind of functional impairment.<ref name="dsm4">{{Cite book| publisher = American Psychiatric Publishing, Inc. | authorlink = http://www.psych.org | title = Diagnostic and Statistical Manual of Mental Disorders DSM-IV TR (Text Revision)| date = June 2000 | location = Arlington, VA, USA | isbn = 978-0-89042-024-9 | doi = 10.1176/appi.books.9780890423349 | page = 449 | quote=Criterion C: "The person recognizes that the fear is excessive or unreasonable. Note: In children, this feature may be absent."}}</ref> True medical phobias of firearms and other weapons can exist, but are unusual.<ref name=Ninan>{{Cite book | last1 = Ninan | last2 = Dunlop | title = Contemporary Diagnosis and Management of Anxiety Disorders | year = 2006 | publisher = Handbooks in Health Care | location = Pennsylvania | isbn = 1-931981-62-0 | pages = 107 | quote = Table 7-1 Names of Some Phobias...Unusual...Hoplophobia-fear of firearms }}</ref> |