From the looks of it.. Delta has been under pressure for the past few weeks to take a position on guns by the National Rifle Association and the students of Marjory Stoneman Douglas High School. The students have come together with outraged survivors and victim's family members to reinvigorate the nation's gun control movement. They have taken advantage of their social media skills to pass on their message to NRA. And now it's no surprise that Delta took a stand to end the benefits and discounts for NRA members.
This is a huge step towards tightening the gun control policies. I believe at this pace, misuse of guns is going to be slashed by great a percentage very soon. Although it's hard to eliminate the risk of mass shootings, these few policies coming up will reduce the likelihood of such events. This has been a long time coming for innocent people that are always prone to getting attacked or victimised when these shootings occur.