source
ok - you're back on topic.
The Bush campaign cannot 'plausibly deny' (remember that gem from the Regan years?) the tight correlations between itself and 'an independent expenditure campaign' the two were tightly knit, and led by Roger Atwater. Atwater repented of playing the race card during that campaign on his deathbed. The point is, Bush shamelessly played the race card that election...hell, he defined it for future generations.
I don't believe anywhere in the movie did MM imply that the NRA meeting was held because of Columbine, rather, he was expressing his (and the parents') disgust that it would continue despite Columbine.
I remain unconvinced.