afghan soldier arrests

how can it be that only since more aussies (and others) get killed by those they are training can we suddenly only just discover that 100's of those being trained have links to the taliban or insurgents or whatever label they have these days. surely we checked when they first rocked up for training? 100's of afghan soldiers have been arrested because of having so called links to those we are fighting. is this really such a big revelation? how can we only find out now but not before the killings that they have links to terrorist groups? what checks did they do this time that they didn't the first time they arrived. maybe they should just ask them if they support taliban and terrorists. these rock apes are probably dumb enough to answer yes. something smells big time imo. i heard some u.s military einstein saying the other day that 25% of all attacks are made by the taliban. so 75% are done by people that just generally hate us being there. the taliban now it seems are almost the good guys in comparison. didn't we just go there to stop the taliban regime? or was it secure the heroin trade? if its only 1 of those 2 reasons so far the heroin trade is the answer.
just get the hell out of there. why doesn't obama have his drones hammering them? he can blow up kids in pakistan but terrorists in afghanistan are immune.