The BE1900 crash at Dillingham, Alaska was a freighter as well. But, no government attention on that one. Not even a docket so far. It happened 5 months before UPS.
But, the NTSB is taking up the UPS accident because the pilots likely screwed up. OTOH, at Dillingham it was a gross, fundamental screw up by a government employee; the controller.
Naw, the NTSB isn't subjective or biased.