That's not what I'm saying at all.
I'm saying that, from 1994-2004 (the entire period the assault weapons ban was active), the number of violent crimes was between 1.3-1.9 million. In 2011, it was 1.2 million.
From 1994-2004, the total number of murders was between 15,500-23,330. In 2011, it was 14,612.
From 1994-2004, the total number of assaults was between 847,000-1.1 million. In 2011, it was 751,131.
Violent crime over the years has declined at a very steady rate, with or without an assault weapons ban. If I thought a ban would actually do anything besides restrict freedom, I'd be all for it. However, statistics say it won't.
As an aside, lets not forget when columbine, the most famous of these type of incidents, occurred: 1999, right in the middle of the assault weapons ban.