They have done no good. They have only provided the illusion of security, nothing more.
http://ronpaulinstitute.org/archives/featured-articles/2019/february/04/shut-down-the-tsa/?fbclid=IwAR2UI-FggCYb1yvdXwA2exhmBLZi5zELLxl851isFjARzGqdtaG7WxIE1bU
