Sorry, you are absolutely correct. I bypassed that part at the end. What is the purpose of any of this (killing, murder mayhem)? These people who plot these acts aren't even human, nor animals lower on the evolutionary chain. I don't know what they are.
Look at the eyes of the terrorists and you see a dark emptiness, an evil eye... I looked at the most wanted terrorists and posted some of those pictures here and it is obvious that they are possessed with an evil will. I believe that this is what happens to them when they twist and distort the will of Hashem in this world. The evil which is in their souls appears on their faces. They cannot hide from their own evil and it will be what destroys them.
Hashem created the evil inclination in mankind. We are merely human beings with a limited perception of reality. We cannot see the 'big picture' of the entirety of Hashem so we have to ask why there is evil in this world. I accept that it exists. It exists as a force against me, and I must press with my will against it. Like in physics, for every action there is an equal but opposite reaction. There is friction, there is resistance, and there is opposition.
The yetzer hara, is the Satan, is the angel of death. This is taught in the Talmud. Our own evil inclinations {and the terrorists own evil inclination} acts as the Satan, the one who prosecutes us for our misdeeds in the next world, is the one who carries out the death sentence on the physical body.