1. Of course it was for no reason. They knew very well it will end in disaster for the whole region but had to show to the American people that they are doing something in response to 9/11. The worst is that they knew they will lose thousands of soldiers because the local fighters would draw them into guerilla like ambushes, yet they still sent them over. Did they care about the lives of their soldiers??
Have you heard once that France, Germany or Belgium are talking of marching into the countries where those "terrorists" from last year's attacks came from??? No, they solve it how civilized people are expected to, by using the laws that are in place, not arms and brute force.
2. From the well-known Cato Institute
In regards to the countries on the banned list:
"Foreigners from those seven nations have killed zero Americans in terrorist attacks on U.S. soil between 1975 and the end of 2015."
This is a hilarious part of their report where they go through the total 580 convictions related to terrorism since 9/11:
"First, 241 of the convictions (42 percent) were not for terrorism offenses. Senator Sessions puffed his numbers by including “terrorism-related convictions,” a nebulous category that includes investigations that begin due to a terrorism tip but then end in non-terrorism convictions. My favorite examples of this are the convictions of Nasser Abuali, Hussein Abuali, and Rabi Ahmed. An informant told the FBI that the trio tried to purchase a rocket-propelled grenade launcher, but the FBI found no evidence supporting the accusation. The three individuals were instead convicted of receiving two truckloads of stolen cereal. That is a crime but it is not terrorism."
Also:
"The annual chance of an American dying in a terrorist attack committed by a refugee is one in 3.6 billion."
Further:
- on average 9 people / year were killed on American soil since 9/11 by Muslim extremists
- on average 12,843 people / year are killed by guns
So ban people from other countries who do you no harm, but allow over 12,000 people to be killed by weapons in American hands every year as that does not warrant a ban or pose a thread to national security.