Here is an interesting blog post by John D. Cook on how too much news creates an "Inverted Sense of Risk" http://www.johndcook.com/blog/2014/09/05/inverted-sense-of-r...

While I highly recommend not being too connected to the concretes and noise of the day, i.e. news, I think sticking your head in the sand is not such a great idea either. Nobody planned on or set out to design and build tanks, cars, plane, guns, bombs, ciphers or databases for the Nazis but people actually did.