I don't think he's saying computers make our lives more difficult, he's saying that technology has made protecting everything we hold dear, (especially our personal information and privacy) as well as our country's more complicated, 30 years ago if you wanted to publish messages going back and forth from john podesta for example to the Clinton campaign you'd have to break in to a mail records room and make off with multiple boxes of paper documents, now its all soft, none of it can be truly protected forever. there will always be loopholes and new hacking techniques that will make keeping things classified online even more difficult as time goes on. 20 years ago we had no "cyber security taskforce." so yes, computers have made national security more complicated