The NRA is silent on this because Philandro is everything they don't want law abiding gun owners fo look like. He was driving around actively getting stoned, which means if he bought his carry piece from an FFL he lied on his 4473, lied on his CCW application and was engaged in endagering his child. He was also, at that moment, under the 68 GCA a prohibited person, legally unable to carry or own a gun due to the lying on his paperwork about not using marijuana and using it while driving and carrying.
By definition he wasn't a law abiding gun owner, looks bad to back someone in this case, and also maybe, just maybe the effects of being high may have something to do with his delayed reaction time and his girlfriend's strangely disconnected and calm demeanor.
BUT personally I have zero issues with weed but FFS, does anyone take an objective honest look at things before reacting?