No, I would report it to the appropriate authorities and let them take care of it. Now let me clarify, there is a difference between Self Defense, and Vigilantism. I fully support the right of any individual to protect themselves. However, it sounds more like you are wanting to allow the "hunting" of terrorists, and that I do not support. After all, what is next? And who is a terrorist? A lot of people would claim (and with justification) that drug dealers and gang members are Terrorists. Should we go out hunting them also? And remember, I support self defense, but nobody has the right to kill another person. A person's death in the event of self defense is a consequence, but should never be the intent. Not to long ago there was a guy convicted of murder because after shooting a robber, he then gave the perp a "finishing shot" while he was laying on the ground.