Is this a serious response?

Do you seriously believe that among the thousands of mass shootings to have taken place in America since 9/11, none were the work of sane people trying to make a statement? The shooting death toll of people trying to make a statement since 9/11, exceeds the death toll of 9/11.

Maybe you missed that since it's diluted by all the other shooting death of children and random citizens.

Though it would be unkind to accuse you of being that dense.