I work and live in Lagos, Nigeria.  I fly Delta a lot, as they have a non stop flight between Lagos and Atlanta.  A lot of people that I  work with (a large US Oil company) also fly Delta.  Suffice to say, we are one of Delta's larger corporate accounts.  I have emailed the Delta exec for West Africa and voiced my displeasure with the ban by Delta and others.  I doubt that it does any good, but who knows.
I asked the guy how an airline, which is designated a "common carrier" can arbitrarily ban legal and safe commerce.  What's next?  Why not ban blue suitcases or green duffle bags.  I then asked him if people who work for oil companies might get banned one day.  Maybe people involved in fracking.
Can you imagine if a guy was involved in fracking and hunting and his hunting buddy was a certain dentist............

  Might be banned for life.
I hope SCI or NRA pursues legal avenues on this.  Perhaps restriction of free trade or interstate commerce.  Would love for the lawyers/hunters to step up on this.
I'll post his reply, assuming I get one.