Here's my op-ed that uses long-term orientation, probabilistic thinking, numeracy, consider the alternative, reaching our actual goals, avoiding intuitive emotional reactions and attention bias, and other rationality techniques to suggest more rational responses to the Paris attacks and the ISIS threat. It's published in the Sunday edition of The Plain Dealer, a major newspaper (16th in the US). This is part of my broader project, Intentional Insights, of conveying rational thinking, including about politics, to a broad audience to raise the sanity waterline.
There is a great deal of evidence about radicalization as a result of western actions, for example this account.
As a historian of modern European history, I can attest that archival evidence shows such slaughter did make it more difficulty to de-Nazify Germany.
There was a lot less general slaughter after WWI, so it should have caused Germany to be demilitarized a lot better then after WWII, oh wait.