I don't think anybody asked anyone to fight for them... it was more like the USA are now going to invade AF, as an extension of Iraq, and are our 'pals' the Brits, going to help us - which translates to, are you going to share the trouble we're going to make.
So one 'evil' force went after another.. currently the result is a draw, and with the pullout, you lose...

again!!
So WHEN are the US and Brits going to have that light-bulb moment that your 'leaders' are dragging you through the desert sand, literally, and you all think it's for a good cause and patriotism. I'm afraid you have been hoodwinked again for a simple reason.
The Middle East (and most of the world) is a completely different culture to the West, they think and operate differently and this is not going to change... whether these guys live next to you, or across a continent or two. To think you're going to change their way.. to your way... nah nah!! no amount of bombing/killing, short of extermination, is going to change that.
So what are the real reasons for the invasion.. a question not really answered yet !

