Yep. Ok. I understand what you're saying. There is no 'cure all', a range of actions have to be employed including treating the underlying cause of disenfranchisement or radicalisation and gun control. You seem to be talking specifically about terrorism too, I'm talking more broadly about firearm deaths in general. Firearms have almost the greatest potential for killing large amounts of people rapidly and efficiently. If using firearms wasn't an option mortality rates would drop significantly. Be glad explosives aren't as easily accessible.