I am from the UK, and I'm happy that nobody has guns. and you know this...why? because your government says so? Do you think all the criminals handed in their guns when they became illegal? Sure, I may not have one to protect myself, but it means the attacker won't have one to attack me with! so you with nothing against a guy with a knife will end up better than if you both had guns? It works this way with anything. At least a knife doesn't travel at 800ft per second. no but the perp can stab you in 800ms before you even know what hit ya.
Anyone ever used a laser for self-defense?! so you are interested in self defense with a device that has ranged capability, lol I can't imagine someone wanting to bother me when they know I can instantly blind them, forever. no, as another poster mentioned, the regular joe isn't even aware that there are lasers that can instantly blind. "Threatening" a perp with a laser might elicit a laugh at the most (Just a thought - safety comes first!) so that means you have to make sure you are wearing your goggles all the time when you carry your laser, and then be 100% sure you are only going to hit the perp in the eyes. Not that it matters, because even if you could somehow hit a guy in both eyes before he can evade, either you get lunged at with a knife, or you get arrested and do some serious time for permanently harming another human being when he just wanted your wallet