We drop bombs on weddings, how are we not purposefully targeting civilians.
There have certainly been a few instances of bad intelligence, other times when disproportionate force may have been used, and still other instances when there was too much collateral damage in proximity to the legitimate bad guys. However, in each of those situations, the wedding guests -- innocent civilians -- were not the ones being "
targeted."
In warfare, the difference between outright murder and collateral damage comes down to the
intentions of those who pull the triggers.
Which is why you need to decide if you are
for the war, or completely
against the war -- there is no middle-ground or in-between. Should you decide that you are for the war, then the innocents who may die as a result of the war are
to be expected.
So, are you
completely against the war in Afghanistan specifically? If not, then you need to understand that
accepting the loss of innocent lives is part of that decision and therefore part of the conscious burden you take on when you pledge your support.
The loss of many innocent lives is a large part of warfare, period.