jno obviously they could not seal the 1,640 mile border 100% but could make a much better job of it than at present. Most of it could be done by helicopter, heat seeking devices, spy planes, and satelite surveilance.
Regarding your PR disasters that happen when you bomb a wedding party where people are shooting into the air.
If they are wild enough to shoot of weapons into the air at a wedding, they deserve to be bombed, especially in a war zone. Try shooting a weapon into the air in your local high street and see what might happen.
http://news.bbc.co.uk/2/hi/south_asia/6232167. stm
This link is interesting, it seems it is the Afghans that are proving the awkward bu**ers, I say "leave them to it to then and pull our troops out".