Widebody freighters do seem to crash much more often than widebody airliners in the past couple of decades. Whether the standards for pax and cargo flying should be the same has long been hotly debated here and elsewhere.
If hamstrung by pax carrying hazmat and other riskier cargo restrictions, there'd likely not be a cargo company around beyond those carrying flowers from South America. An over exaggeration of course but given the nature of the business, cargo outfits won't achieve parity with the safety record of pax carrying airlines when looked at in totality.