You're proving his point?

People will buy this with the intent of misusing it, therefore the government should stop people selling it.

Sure. Can you afford to pay damages after you inadvertently blind yourself, and everyone else in a hundred meter radius around you, with diffuse reflections off whatever you point the laser at?

That's a selfish framing, though for that poster it's probably a good choice. However the thing that they really should worry about is harming others in the first place. If I was blinded by them, money would be great to get but no amount is going to make up for the fact that I'm blind.