I haven't researched the CATO Institute's study - just referenced what the writer did.  However, phrases such as "obviously ..."  and "likely defined" reflect no factual basis from your viewpoint either.  Show us some stats to prove your case or read the study and determine why - or if - there is no count of 9-11.  Anything else is conjecture and opinion.  BTW, the op-ed is an opinion, but it's based on someone's experiences and statistics that I know are not far off the main point = a huge majority of the death's in the U.S. on our soil are done by people from here - not refugees.  I have seen other studies say the same.  I don't support any of the "attacks" that result in death in the U.S., but knowing the source is important if you want a real solution.  Which is the underlying theme of the original piece - a real solution is not the goal of the recent ban (or politics in general).