I would have them hand write all the books they burned.
He meant, if they couldn't distribute the books because they were certain it would incite violence and anger, and they couldn't send them back for fear they'd be sent again (and incite violence and anger), and they had no place to store them, what should they have done with the books? Is there some other country that has need of Pashtun bibles?
They threw them out, and they incinerate their trash. It's nothing like when American Christians burn secular literature, or when Communists burn classical literature. Those groups burn books as a symbolic gesture of rejection of a particular idea. These books were just burnt because they were garbage. (Literal garbage, not symbolic garbage.) I'm sure many of the soldiers who made the decision to throw them away and act upon it were Christians themselves, and have nothing against the Bible.
It's not enough to say "burning books is wrong". What if you're locked in a library and it's 40 below, and if you don't think of a way to keep warm you'll die of hypothermia? Would it be OK to burn a small pile of Harlequin Romances so you could live through the night? Yes? Then "burning books" is not wrong. Burning books
as a symbolic rejection of an idea is wrong.