To add, here's
Jeff Knox's take on it. Knox can be prickly, but he's right on this.
Frankly, I've wanted LaPierre gone since the "jack boot thugs" thing, and he bears responsibility for some truly horrifying missteps in public perception (the "Target Practice" ad, the Dana Loesch "We're Coming for You" ad).
Meanwhile, they appointed Oliver North as President. Any other corporation with a whiff of common sense would realize how (to put it mildly) controversial a choice that was.
Under his leadership, the NRA has come to look clueless, blatantly partisan, and out of touch with younger gun owners. Add their full-throated support for the bump-stock ban, and they have a massive PR problem.