You can argue with the data. However, this is a case of politics and no one will pay the price in the administration for the deaths in Mexico.
“….Law enforcement officials in both countries acknowledge that 70 to 80 percent of the traceable guns seized in Mexico can be tracked to the United States. Mr. Poire Romero, a top Mexican national security and criminal justice official, offers additional evidence that the United States has been an enabler of the violence.
In 2005 roughly one-third of the seized guns were assault weapons. Today, according to Mr. Poire Romero, assault weapons represent 60 to 65 percent of the guns confiscated by Mexican authorities. The assault-weapons ban in the United States lapsed in 2004….”
Lax U.S. gun laws enable killing in Mexico