If the Taliban/AQ win control of Afghanistan there is a much much higher probability of groups with similar political leanings gaining power in Pakistan, and getting their mitts on the big red button in Islamabad.
That would be bad. For all of us.
(This is not my justification for the war, but my understanding of the UK Government's justification.)
Fixing a problem that out state/government/sovereign/whatever created years ago doesn't make the non supporters any more supportive.
Fixing a problem that out state/government/sovereign/whatever created years ago doesn't make the non supporters any more supportive.