I don't think that the MOAB killed anyone.

[Jehanne]

I don't think that it did; I think that the real intent of the military was to get some test data for their new weapon.

MOABs aren't new.

This particular weapon is new, the largest conventional (non-nuclear) weapon on the planet.  There are not many places in the World in which the US military can test it; what better place than testing it out on ISIS in a remote location in Afghanistan?  Another possibility is that The Donald wants to start "justifying" the use of low-level/yield nuclear weapons in the region, by claiming that the largest conventional weapons are not sufficient to do the job.