One of my favorite quotes is a quote by Bruce Simpson.
"In the 21st century, technology plays no favorites -- technology is the slave of anyone who chooses to master it."
He wrote this in an article discussing the feasibility of terrorists building and launching a pulsejet-based ballistic missile. Of course, it's totally possible to build one, I mean, I know how to build a FREAKING NUCLEAR WEAPON right off the top of my head, so it's inconceivable that there isn't someone out there with my talents who's completely turned to the dark side.
But is it really worth it? No. Explosives really aren't the most efficient way of killing many people. Toxic gas is. Or biotoxic agents, it really depends on the desired effect.
But either way, no matter how much we try, the only way to beat our enemies is to be more cunning and subtly dangerous than they are.