These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Bowling for Columbine
Anvilicious: Mid way through there is a segment of America intervening in other countries while ignoring the atrocities those countries were responsible for, and you don't need to watch very far to see where it is going. True enough, it cuts from saying Bin Laden had American support to the September 11 terrorist attacks.
Some Anvils Need to Be Dropped: American gun crime is out of control. American fear is out of control and it's practically destroying United States from inside.
Though one might note that the phrases "gun crime is out of control" and "fear is out of control" might be somewhat counterweighted anvils, as stating the former that way is rather reinforcing the latter.
And Germany, Britain, Japan and France have histories just as filled with atrocities and violence (if not more so) than the USA, but much lower gun-crime rates.
Strawman Has a Point: Moore originally planned to criticize the National Rifle Association's "Guns Don't Kill, People Do" motto. He then learned that there were much higher gun ownership rates in countries other than America (which have much lower gun-related violence statistics), making him believe that their motto is more or less correct.
Tear Jerker: An interview with one Colorado man who remembers the massacre (and starts openly weeping) brings this to mind.
The emergency call from the Elementary School after the shooting of Kayla Rolland. Itís horrible hearing her voice: she's just frantic and hysterical the whole time, and praying to God to let her live.
That's only the beginning. It gets even worse once we find out the details of everything that led to the shooting - a boy found a gun in his drug dealer uncle's house, decided to take it to school, and accidentally shot Kayla in the middle of class. Evidently, the school's fate: closed down in 2002, demolished seven years later. It's not a cover-up.
During Moore's interview with Charlton Heston, Kayla's murder is brought up, causing Heston to deem the interview over. Moore doesn't do anything else, he only leaves a picture of Kayla Rolland by his door.