"People might think that this is some sort of amusing prank, but I can assure you that it could have had deadly consequences."
You're kidding me right? People don't think it's a prank at all, they really don't know that shining the thing at an aircraft is dangerous in any way. I'm sure the kid didn't shine the thing on the helicopter thinking "Hey, I'm going to blind a pilot today!", more like "I wonder how far this will go, I need something to aim at, oh hey! There's something!".
He just aimed it at the first distant thing he saw, probably to see if he could see the beam and follow a moving object with it.
The fact that this kid got 4 months for that is retarded. Was it dangerous? Yes. Is it common knowledge that it is dangerous? No. Was it intentional? I doubt it.
This was not a crime, it was a combination of an unnecessarily powerful product and lack of knowledge, and an understandable lack of knowledge at that. This warranted an apology, not a jail sentence.