Congress blocks gun violence research

This fact comes up every time there is one of these shootings. Now why do you suppose that is?

"A policy rider that has been including in spending bills since 1996 effectively bans the Centers for Disease Control and Prevention (CDC) from researching gun violence. The so called the Dickey amendment has not definitively outlawed research on gun violence and safety, but Congress 'coincidentally' removed funding from the CDC to the exact amount it once spent on that research. This sends the message to CDC scientists that such research is strongly discouraged, deprioritized, and ultimately, it is not conducted."