This is a different age with enemies that don't wear uniforms & come from many regions. islam not a religion -but a system- is akin to a new, dangerous virus - threatening a pandemic of disease.  muslims repeatedly commit atrocities, brag about them & scream for the elimination of Israel & Jews, death to America, etc. 
   So what more is there to know about islam? European nations that have generously admitted multitudes of muslims have seen that muslim malevolence for all infidels will quickly come to the surface. So much worse if the islamists are embedded in a free society to do it harm from within.

   Extremism in defense of freedom is not a vice, but tolerance of any clear & present danger is a foolish, lethal error.

   Better that we err on the side of national self-interest than acquiesce to political correctness or intangible liberalism.

   Liberals seem to think that human nature can be changed. I do not. We'd better look out for our own children, laws, & way of life.