Don't fall into the fear trap ... bombmaking goes back centuries, as of course does violent actions; these days more and more considered terrorism.
Many folks don't know that there was a bomb detonated on Wall Street that killed some people early in the 20th century ... bad things have always happened.
Or take the Columbine massacre ... killed 13 (15 including the killers) ... and yet it was NOT the worst school killing in the U.S. ... that's right there was a school killing even worse back in the 1927 in which a school board member detonated dynamite under a local school killing about 40 children - do some googling around for details.
Point of my tirade is that extrame violence, now often referred to as terrorism, is nothing new ... information itself isn't the problem, it's what people do with it.
Anyways, do some googling around for bomb making - you're not going to stop the dessemination of such information ... heck, one can find various books all about explosives, including manufacture, at libraries ... or even easier yet ... Amazon.com, etc.
Lastly, take a break from reading/viewing the "news", take a deep breath, and chill out ... enjoy the good things in life
Ron