The problem with this argument is that a hard drive and knife have real purposes.
What is the purpose of this thing other than to hurt people and burn things? Do you need to point at something in another room 30 miles away?
All you do is destroy the environment by driving a car and expelling waste, do we really need you? What purpose do you serve? This laser can have useful purposes like many other things, but you don't think about those other purpose other than how someone can get hurt by it, which makes me wonder, how much harm have you caused others using various objects? Surely you wouldn't say such things if you didn't have perosnal experience at some pont in your life whether you dealt it or ended up on the receiving end. I hope you aren't so dense that you miss the point.
This laser could be used for cutting things among other uses, and yes, it is dangerous and people can get hurt by it. Knives are not solely weapons, but tools that can be used for numerous other things besides hurting people. Should we ban you because your fists can hurt someone? It isn't the tool/weapon/whatever else that is the problem, it is people and motives.
Banning stuff like this won't solve the problem because the problem lies much deeper than external objects that can be used as weapons.
The more dangerous aspect to this thing is that you are far more likely to get cancer using the thing because of the spectrum where blue light falls. The recommend covering any exposed skin. I did some reading about this thing and I'd like to have one to try it out, but I don't think the risk is worth it.