Why Did America Spend So Many Years Supporting A Known Terrorist Organisation...?

...such as the IRA only to declare a 'War on Terror' when it suited their purposes?
Update: Americans - please read the question first. I am not talking about the Taliban...
Update 2: biily m - So you are sayin g the innocent lives lost in the Warrington, Omagh and numerous bombings by the IRA where acceptable losses? Sick!
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