I would love to see where you are getting your data. I cannot find it. What I read says that both her number of school shootings and the number of mass murders in the US has gone up in since the 1990s. There was a small respite when Bill Clinton got the assault weapon ban passed but other than that it has increased. Yes homicides with guns is down but not mass shootings. Here is a list of the school shootings in the US by decade. Thanks. https://en.wikipedia.org/wiki/List_of_school_shootings_in_the_United_States.