I didn't realize you could plant C4 or other explosives around critical areas by doing it over the internet. Also, what makes you think they have their critical computer systems connected to the internet like many "stupidly managed" companies do.Key words in the article: High Purity
You're free to believe anything that you want. Just because you believe it and others have said so, does not make it true. Border closings won't stop a cyber attack, but keep believing they will and maybe your belief will make it happen. ....