Why Are We In Afghani-nam?

Two more attacks by our Afghan allies yesterday left six coalition members dead--bringing the year's total to 51.    There were 35 all of last year.  And:  "It also represents a marked increase from just a few years ago, when such attacks were often described by the coalition as one-offs and not part of a larger pattern or problem. In 2007 and 2008, for instance, a total of four coalition service members were killed by Afghan forces."