Brilliant Questions, if not answers IMHO many of the best movies about social problems only have to ask good questions, rather than preach solutions to the audience. Do the Right Thing and Traffic are two examples of this phenomenon, and Bowling for Columbine is certainly in this category. Moore asks all the right questions about America's culture of violence - not just gun violence - and comes away as confused as we are about the possible solutions. I'm glad he didn't just point the finger at gun ownership, movies, religion, or any one thing as the bogeyman which brings us such horror.
The only problem I had with the film was Moore's treatment of Charlton Heston, who (as we know now) suffers from Alzheimer's Disease. It was painfully obvious from Moore's interview that Chuck ain't as sharp as he once was, and he made an unfortunate slip of the lip that might lead the audience to think he's a racist. I don't know the guy, but I do know he marched on Washington with MLK Jr., back when being down was not cool at all. So IMHO he's earned the benefit of a doubt on that particular issue.
Overall, a great, great movie that everyone should see. There is some graphic violence of people actually getting shot, so those with weak stomachs may wish to skip it.