Lyndon Johnson had the War on Poverty. Ronald Reagan had the War on Drugs. George Bush had the War on Terror. Bill O'Reilly has the War on Christmas. I've been know to refer to the War on Science or the War on Education.
When we declare "War on" something, it is supposed to suggest a coherent all-in approach to tackle some ill. When we declare someone else had declared "War on" something we suggest a conspiracy or coordinated attack on some good.
Is there any harm to using this metaphor? Is it helpful?