No such thing as safe , and no such thing as secure . Time to get used to that .
It’s tough enough when any jerk with a bug up his attitude, can easily cause millions in damage and danger, if not death to hundreds of thousands of citizens. But we can handle and fix a few problems at a time. A well-coordinated attack could cause enough widespread havoc that permanent destruction of the electrical grid might not be necessary. Letting in unaccounted (and uncounted) strangers does bode well for our well-being or sovereignty. And a cadre of homegrown traitors could make the importation unnecessary, anyway.