There's lots of charities that work in far-flung places, including mid Asia, that manage to generally keep track of where their funds go to. The whole thing of Mortenson spending money, flying around the country on private jets - using the charity's donated money, is just the tip of the iceberg.
It's pretty obvious he lied about his travels over there, lied about being captured by the Taliban, and stonewalled any reasonable request to account for all the money he was spending - in the US and overseas. Liar and cheat.
Oh - and you may want to look into it more. It wasn't JK that blew the whistle - it was Charity Watch (foremerly the American Institute of Philanthropy) - a non-profit that monitors and rates charities. Early on they called for Mortenson to resign and for the Central Asia Institute to come clean - they never did, which is why they were investigated by the MT Attorney General. Has Mortenson done no good? - of course not - but the amount of money he defrauded from donors, spend on shit for himself, and to build up his image - completely separate and way, way outside the legal practices of charities led to the Central Asia Institute getting an F and recommendation of "don't send money here" from Charity Watch. You may not like JK, but what? - Charity Watch, the DA of Montana, and 60 Minutes are making stuff up too. Sheesh.
And if you do want to help kids in the region here's a list of charities that do pass muster and don't cook the books for self-profit. What a surprise - accountability!!
The Decent Charities