this is a very normal response to a very tragic and dangerous event!  by extension, the US must be taking firm and aggressive steps to prevent this type of event from occurring within our borders - despite all the "welcoming" dialog and actions of certain persons and groups.  there comes a time to gently put down the veil of "political correctness, sensitivity, and inclusion" and directly address the hard, verifiable, and factual information we have now, at this moment, AND ACT appropriately, decisively, and swiftly.  i'm just saying...without opening the doors to harsh criticism and never-ending dialog....and there has already been much said on this matter without discussing it again!  suffice as to say that a certain group of our recently deposed high politicians have allowed this critical situation to proliferate with great impunity....until now!  the dice have been cast!  let's either play the "game" with the present set of rules as set by others - or walk away from the table!